Remove `style-scope` from lit diff

This was removed while migrating gr-diff.ts to lit. The diff-row and
diff-section lit components were created before that. Thus we have to
catch up with such changes that have happened since April.

Release-Notes: skip
Google-Bug-Id: b/237393560
Change-Id: I3aecc2069dc51555e7e04694e3c1d282ae7062d9
diff --git a/polygerrit-ui/app/embed/diff/gr-context-controls/gr-context-controls-section_test.ts b/polygerrit-ui/app/embed/diff/gr-context-controls/gr-context-controls-section_test.ts
index 7f920d5..aa29ac3 100644
--- a/polygerrit-ui/app/embed/diff/gr-context-controls/gr-context-controls-section_test.ts
+++ b/polygerrit-ui/app/embed/diff/gr-context-controls/gr-context-controls-section_test.ts
@@ -29,33 +29,33 @@
         <table>
           <tbody>
             <tr
-              class="above contextBackground gr-diff side-by-side style-scope"
+              class="above contextBackground gr-diff side-by-side"
               left-type="contextControl"
               right-type="contextControl"
             >
-              <td class="blame gr-diff style-scope" data-line-number="0"></td>
-              <td class="contextLineNum gr-diff style-scope"></td>
-              <td class="gr-diff style-scope"></td>
-              <td class="contextLineNum gr-diff style-scope"></td>
-              <td class="gr-diff style-scope"></td>
+              <td class="blame gr-diff" data-line-number="0"></td>
+              <td class="contextLineNum gr-diff"></td>
+              <td class="gr-diff"></td>
+              <td class="contextLineNum gr-diff"></td>
+              <td class="gr-diff"></td>
             </tr>
-            <tr class="dividerRow gr-diff show-both style-scope">
-              <td class="blame gr-diff style-scope" data-line-number="0"></td>
-              <td class="gr-diff style-scope"></td>
-              <td class="dividerCell gr-diff style-scope" colspan="3">
+            <tr class="dividerRow gr-diff show-both">
+              <td class="blame gr-diff" data-line-number="0"></td>
+              <td class="gr-diff"></td>
+              <td class="dividerCell gr-diff" colspan="3">
                 <gr-context-controls showconfig="both"> </gr-context-controls>
               </td>
             </tr>
             <tr
-              class="below contextBackground gr-diff side-by-side style-scope"
+              class="below contextBackground gr-diff side-by-side"
               left-type="contextControl"
               right-type="contextControl"
             >
-              <td class="blame gr-diff style-scope" data-line-number="0"></td>
-              <td class="contextLineNum gr-diff style-scope"></td>
-              <td class="gr-diff style-scope"></td>
-              <td class="contextLineNum gr-diff style-scope"></td>
-              <td class="gr-diff style-scope"></td>
+              <td class="blame gr-diff" data-line-number="0"></td>
+              <td class="contextLineNum gr-diff"></td>
+              <td class="gr-diff"></td>
+              <td class="contextLineNum gr-diff"></td>
+              <td class="gr-diff"></td>
             </tr>
           </tbody>
         </table>
diff --git a/polygerrit-ui/app/embed/diff/gr-diff-builder/gr-diff-row.ts b/polygerrit-ui/app/embed/diff/gr-diff-builder/gr-diff-row.ts
index 2d42aec..2cf2da1 100644
--- a/polygerrit-ui/app/embed/diff/gr-diff-builder/gr-diff-row.ts
+++ b/polygerrit-ui/app/embed/diff/gr-diff-builder/gr-diff-row.ts
@@ -113,13 +113,13 @@
   private renderInvisible() {
     return html`
       <tr>
-        <td class="style-scope gr-diff blame"></td>
-        <td class="style-scope gr-diff left"></td>
-        <td class="style-scope gr-diff left content">
+        <td class="gr-diff blame"></td>
+        <td class="gr-diff left"></td>
+        <td class="gr-diff left content">
           <div>${this.left?.text ?? ''}</div>
         </td>
-        <td class="style-scope gr-diff right"></td>
-        <td class="style-scope gr-diff right content">
+        <td class="gr-diff right"></td>
+        <td class="gr-diff right content">
           <div>${this.right?.text ?? ''}</div>
         </td>
       </tr>
diff --git a/polygerrit-ui/app/embed/diff/gr-diff-builder/gr-diff-row_test.ts b/polygerrit-ui/app/embed/diff/gr-diff-builder/gr-diff-row_test.ts
index 75214a8..4e8bb62 100644
--- a/polygerrit-ui/app/embed/diff/gr-diff-builder/gr-diff-row_test.ts
+++ b/polygerrit-ui/app/embed/diff/gr-diff-builder/gr-diff-row_test.ts
@@ -32,27 +32,25 @@
         <table>
           <tbody>
             <tr
-              class="diff-row gr-diff side-by-side style-scope"
+              class="diff-row gr-diff side-by-side"
               left-type="both"
               right-type="both"
               tabindex="-1"
             >
-              <td class="blame gr-diff style-scope" data-line-number="1"></td>
-              <td class="gr-diff left lineNum style-scope" data-value="1">
+              <td class="blame gr-diff" data-line-number="1"></td>
+              <td class="gr-diff left lineNum" data-value="1">
                 <button
-                  class="gr-diff left lineNumButton style-scope"
+                  class="gr-diff left lineNumButton"
                   data-value="1"
                   tabindex="-1"
                 >
                   1
                 </button>
               </td>
-              <td
-                class="both content gr-diff left no-intraline-info style-scope"
-              >
+              <td class="both content gr-diff left no-intraline-info">
                 <div
                   aria-label="lorem ipsum"
-                  class="contentText gr-diff left style-scope"
+                  class="contentText gr-diff left"
                   data-side="left"
                 >
                   <gr-diff-text>lorem ipsum</gr-diff-text>
@@ -61,21 +59,19 @@
                   <slot name="left-1"> </slot>
                 </div>
               </td>
-              <td class="gr-diff lineNum right style-scope" data-value="1">
+              <td class="gr-diff lineNum right" data-value="1">
                 <button
-                  class="gr-diff lineNumButton right style-scope"
+                  class="gr-diff lineNumButton right"
                   data-value="1"
                   tabindex="-1"
                 >
                   1
                 </button>
               </td>
-              <td
-                class="both content gr-diff no-intraline-info right style-scope"
-              >
+              <td class="both content gr-diff no-intraline-info right">
                 <div
                   aria-label="lorem ipsum"
-                  class="contentText gr-diff right style-scope"
+                  class="contentText gr-diff right"
                   data-side="right"
                 >
                   <gr-diff-text>lorem ipsum</gr-diff-text>
@@ -103,36 +99,34 @@
         <table>
           <tbody>
             <tr
-              class="diff-row gr-diff side-by-side style-scope"
+              class="diff-row gr-diff side-by-side"
               left-type="blank"
               right-type="add"
               tabindex="-1"
             >
-              <td class="blame gr-diff style-scope" data-line-number="0"></td>
-              <td class="gr-diff left style-scope"></td>
-              <td class="blank gr-diff left no-intraline-info style-scope">
+              <td class="blame gr-diff" data-line-number="0"></td>
+              <td class="gr-diff left"></td>
+              <td class="blank gr-diff left no-intraline-info">
                 <div
                   aria-label=""
-                  class="contentText gr-diff left style-scope"
+                  class="contentText gr-diff left"
                   data-side="left"
                 ></div>
               </td>
-              <td class="gr-diff lineNum right style-scope" data-value="1">
+              <td class="gr-diff lineNum right" data-value="1">
                 <button
                   aria-label="1 added"
-                  class="gr-diff lineNumButton right style-scope"
+                  class="gr-diff lineNumButton right"
                   data-value="1"
                   tabindex="-1"
                 >
                   1
                 </button>
               </td>
-              <td
-                class="add content gr-diff no-intraline-info right style-scope"
-              >
+              <td class="add content gr-diff no-intraline-info right">
                 <div
                   aria-label="lorem ipsum"
-                  class="contentText gr-diff right style-scope"
+                  class="contentText gr-diff right"
                   data-side="right"
                 >
                   <gr-diff-text>lorem ipsum</gr-diff-text>
@@ -160,28 +154,26 @@
         <table>
           <tbody>
             <tr
-              class="diff-row gr-diff side-by-side style-scope"
+              class="diff-row gr-diff side-by-side"
               left-type="remove"
               right-type="blank"
               tabindex="-1"
             >
-              <td class="blame gr-diff style-scope" data-line-number="1"></td>
-              <td class="gr-diff left lineNum style-scope" data-value="1">
+              <td class="blame gr-diff" data-line-number="1"></td>
+              <td class="gr-diff left lineNum" data-value="1">
                 <button
                   aria-label="1 removed"
-                  class="gr-diff left lineNumButton style-scope"
+                  class="gr-diff left lineNumButton"
                   data-value="1"
                   tabindex="-1"
                 >
                   1
                 </button>
               </td>
-              <td
-                class="content gr-diff left no-intraline-info remove style-scope"
-              >
+              <td class="content gr-diff left no-intraline-info remove">
                 <div
                   aria-label="lorem ipsum"
-                  class="contentText gr-diff left style-scope"
+                  class="contentText gr-diff left"
                   data-side="left"
                 >
                   <gr-diff-text>lorem ipsum</gr-diff-text>
@@ -190,11 +182,11 @@
                   <slot name="left-1"> </slot>
                 </div>
               </td>
-              <td class="gr-diff right style-scope"></td>
-              <td class="blank gr-diff no-intraline-info right style-scope">
+              <td class="gr-diff right"></td>
+              <td class="blank gr-diff no-intraline-info right">
                 <div
                   aria-label=""
-                  class="contentText gr-diff right style-scope"
+                  class="contentText gr-diff right"
                   data-side="right"
                 ></div>
               </td>
diff --git a/polygerrit-ui/app/embed/diff/gr-diff-builder/gr-diff-section_test.ts b/polygerrit-ui/app/embed/diff/gr-diff-builder/gr-diff-section_test.ts
index 043cbde..363b001 100644
--- a/polygerrit-ui/app/embed/diff/gr-diff-builder/gr-diff-section_test.ts
+++ b/polygerrit-ui/app/embed/diff/gr-diff-builder/gr-diff-section_test.ts
@@ -42,29 +42,27 @@
         <gr-diff-row class="left-1 right-1"> </gr-diff-row>
         <gr-diff-row class="left-1 right-1"> </gr-diff-row>
         <table>
-          <tbody class="both gr-diff section style-scope">
+          <tbody class="both gr-diff section">
             <tr
-              class="diff-row gr-diff side-by-side style-scope"
+              class="diff-row gr-diff side-by-side"
               left-type="both"
               right-type="both"
               tabindex="-1"
             >
-              <td class="blame gr-diff style-scope" data-line-number="1"></td>
-              <td class="gr-diff left lineNum style-scope" data-value="1">
+              <td class="blame gr-diff" data-line-number="1"></td>
+              <td class="gr-diff left lineNum" data-value="1">
                 <button
-                  class="gr-diff left lineNumButton style-scope"
+                  class="gr-diff left lineNumButton"
                   data-value="1"
                   tabindex="-1"
                 >
                   1
                 </button>
               </td>
-              <td
-                class="both content gr-diff left no-intraline-info style-scope"
-              >
+              <td class="both content gr-diff left no-intraline-info">
                 <div
                   aria-label="asdf"
-                  class="contentText gr-diff left style-scope"
+                  class="contentText gr-diff left"
                   data-side="left"
                 >
                   <gr-diff-text></gr-diff-text>
@@ -73,21 +71,19 @@
                   <slot name="left-1"> </slot>
                 </div>
               </td>
-              <td class="gr-diff lineNum right style-scope" data-value="1">
+              <td class="gr-diff lineNum right" data-value="1">
                 <button
-                  class="gr-diff lineNumButton right style-scope"
+                  class="gr-diff lineNumButton right"
                   data-value="1"
                   tabindex="-1"
                 >
                   1
                 </button>
               </td>
-              <td
-                class="both content gr-diff no-intraline-info right style-scope"
-              >
+              <td class="both content gr-diff no-intraline-info right">
                 <div
                   aria-label="asdf"
-                  class="contentText gr-diff right style-scope"
+                  class="contentText gr-diff right"
                   data-side="right"
                 >
                   <gr-diff-text></gr-diff-text>
@@ -98,27 +94,25 @@
               </td>
             </tr>
             <tr
-              class="diff-row gr-diff side-by-side style-scope"
+              class="diff-row gr-diff side-by-side"
               left-type="both"
               right-type="both"
               tabindex="-1"
             >
-              <td class="blame gr-diff style-scope" data-line-number="1"></td>
-              <td class="gr-diff left lineNum style-scope" data-value="1">
+              <td class="blame gr-diff" data-line-number="1"></td>
+              <td class="gr-diff left lineNum" data-value="1">
                 <button
-                  class="gr-diff left lineNumButton style-scope"
+                  class="gr-diff left lineNumButton"
                   data-value="1"
                   tabindex="-1"
                 >
                   1
                 </button>
               </td>
-              <td
-                class="both content gr-diff left no-intraline-info style-scope"
-              >
+              <td class="both content gr-diff left no-intraline-info">
                 <div
                   aria-label="qwer"
-                  class="contentText gr-diff left style-scope"
+                  class="contentText gr-diff left"
                   data-side="left"
                 >
                   <gr-diff-text></gr-diff-text>
@@ -127,21 +121,19 @@
                   <slot name="left-1"> </slot>
                 </div>
               </td>
-              <td class="gr-diff lineNum right style-scope" data-value="1">
+              <td class="gr-diff lineNum right" data-value="1">
                 <button
-                  class="gr-diff lineNumButton right style-scope"
+                  class="gr-diff lineNumButton right"
                   data-value="1"
                   tabindex="-1"
                 >
                   1
                 </button>
               </td>
-              <td
-                class="both content gr-diff no-intraline-info right style-scope"
-              >
+              <td class="both content gr-diff no-intraline-info right">
                 <div
                   aria-label="qwer"
-                  class="contentText gr-diff right style-scope"
+                  class="contentText gr-diff right"
                   data-side="right"
                 >
                   <gr-diff-text></gr-diff-text>
@@ -152,27 +144,25 @@
               </td>
             </tr>
             <tr
-              class="diff-row gr-diff side-by-side style-scope"
+              class="diff-row gr-diff side-by-side"
               left-type="both"
               right-type="both"
               tabindex="-1"
             >
-              <td class="blame gr-diff style-scope" data-line-number="1"></td>
-              <td class="gr-diff left lineNum style-scope" data-value="1">
+              <td class="blame gr-diff" data-line-number="1"></td>
+              <td class="gr-diff left lineNum" data-value="1">
                 <button
-                  class="gr-diff left lineNumButton style-scope"
+                  class="gr-diff left lineNumButton"
                   data-value="1"
                   tabindex="-1"
                 >
                   1
                 </button>
               </td>
-              <td
-                class="both content gr-diff left no-intraline-info style-scope"
-              >
+              <td class="both content gr-diff left no-intraline-info">
                 <div
                   aria-label="zxcv"
-                  class="contentText gr-diff left style-scope"
+                  class="contentText gr-diff left"
                   data-side="left"
                 >
                   <gr-diff-text></gr-diff-text>
@@ -181,21 +171,19 @@
                   <slot name="left-1"> </slot>
                 </div>
               </td>
-              <td class="gr-diff lineNum right style-scope" data-value="1">
+              <td class="gr-diff lineNum right" data-value="1">
                 <button
-                  class="gr-diff lineNumButton right style-scope"
+                  class="gr-diff lineNumButton right"
                   data-value="1"
                   tabindex="-1"
                 >
                   1
                 </button>
               </td>
-              <td
-                class="both content gr-diff no-intraline-info right style-scope"
-              >
+              <td class="both content gr-diff no-intraline-info right">
                 <div
                   aria-label="zxcv"
-                  class="contentText gr-diff right style-scope"
+                  class="contentText gr-diff right"
                   data-side="right"
                 >
                   <gr-diff-text></gr-diff-text>
diff --git a/polygerrit-ui/app/embed/diff/gr-diff-builder/gr-diff-text_test.ts b/polygerrit-ui/app/embed/diff/gr-diff-builder/gr-diff-text_test.ts
index 9e8d735..6814fdf 100644
--- a/polygerrit-ui/app/embed/diff/gr-diff-builder/gr-diff-text_test.ts
+++ b/polygerrit-ui/app/embed/diff/gr-diff-builder/gr-diff-text_test.ts
@@ -8,7 +8,7 @@
 import {GrDiffText} from './gr-diff-text';
 import {fixture, html, assert} from '@open-wc/testing';
 
-const LINE_BREAK = '<span class="style-scope gr-diff br"></span>';
+const LINE_BREAK = '<span class="gr-diff br"></span>';
 
 const TAB = '<span class="" style=""></span>';
 
@@ -82,7 +82,7 @@
           '\t',
           /* HTML */ `
             <span
-              class="style-scope gr-diff tab"
+              class="gr-diff tab"
               style="tab-size: ${size}; -moz-tab-size: ${size};"
             >
             </span>
diff --git a/polygerrit-ui/app/embed/diff/gr-diff/gr-diff-utils.ts b/polygerrit-ui/app/embed/diff/gr-diff/gr-diff-utils.ts
index 1f54a89..8a17611 100644
--- a/polygerrit-ui/app/embed/diff/gr-diff/gr-diff-utils.ts
+++ b/polygerrit-ui/app/embed/diff/gr-diff/gr-diff-utils.ts
@@ -198,21 +198,15 @@
 
 /**
  * Simple helper method for creating element classes in the context of
- * gr-diff.
- *
- * We are adding 'style-scope', 'gr-diff' classes for compatibility with
- * Shady DOM. TODO: Is that still required??
- *
- * Otherwise this is just a super simple convenience function.
+ * gr-diff. This is just a super simple convenience function.
  */
 export function diffClasses(...additionalClasses: string[]) {
-  return ['style-scope', 'gr-diff', ...additionalClasses].join(' ');
+  return ['gr-diff', ...additionalClasses].join(' ');
 }
 
 /**
  * Simple helper method for creating elements in the context of gr-diff.
- *
- * Otherwise this is just a super simple convenience function.
+ * This is just a super simple convenience function.
  */
 export function createElementDiff(
   tagName: string,