Revert "Layout fixes (mostly for Safari)"

This reverts commit 37ef1672f9133b605c5e14f8fbcc241d4c40eb50.

Reason for revert: Got a better idea for app layout, will send follow-up change.

Change-Id: I7bfddcef416d44c7af88d74da6b39c2a93565d32
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.html b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.html
index 81da9f6..f995b22 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.html
+++ b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.html
@@ -33,6 +33,7 @@
         background-color: var(--view-background-color);
         display: flex;
         flex-direction: column;
+        height: 100%;
       }
       .titleHeader,
       .patchRangeHeader {
diff --git a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
index 1b41640..a4dff00 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
+++ b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
@@ -50,6 +50,7 @@
         border-collapse: collapse;
         border-right: 1px solid #ddd;
         table-layout: fixed;
+
         /* Hint GPU acceleration */
         -webkit-transform: translateZ(0);
         -moz-transform: translateZ(0);
diff --git a/polygerrit-ui/app/elements/gr-app.html b/polygerrit-ui/app/elements/gr-app.html
index a2705f9..acee383 100644
--- a/polygerrit-ui/app/elements/gr-app.html
+++ b/polygerrit-ui/app/elements/gr-app.html
@@ -56,13 +56,9 @@
         background-color: var(--footer-background-color, #eee);
       }
       main {
-        display: flex;
         flex: 1;
         position: relative;
-        overflow: auto;
-      }
-      main > * {
-        width: 100%;
+        overflow: scroll;
       }
       .errorView {
         align-items: center;