Revert "Fix A11y - reading diff lines"

This reverts commit 36de92d9c7230012ff72fa1d2e92a067b442afaf.

Reason for revert: Blocked by aria test
Release-Notes: skip
Change-Id: I7242e585e6d211eecca992eb93e7b593343bd10f
diff --git a/polygerrit-ui/app/embed/diff/gr-diff-builder/gr-diff-builder-side-by-side.ts b/polygerrit-ui/app/embed/diff/gr-diff-builder/gr-diff-builder-side-by-side.ts
index 314b96b..c982e2b 100644
--- a/polygerrit-ui/app/embed/diff/gr-diff-builder/gr-diff-builder-side-by-side.ts
+++ b/polygerrit-ui/app/embed/diff/gr-diff-builder/gr-diff-builder-side-by-side.ts
@@ -99,9 +99,6 @@
     row.setAttribute('right-type', rightLine.type);
     // TabIndex makes screen reader read a row when navigating with j/k
     row.tabIndex = -1;
-    // This is small hack to enable screen reader to read a row
-    row.setAttribute('role', 'button');
-    row.setAttribute('aria-roledescription', 'Code line');
 
     row.appendChild(this.createBlameCell(leftLine.beforeNumber));