Revert scrollbar freezing. Hopefully some tests will fail.

third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 520 matching lines @@
   LayoutUnit afterEdge =
       borderAfter() + paddingAfter() + scrollbarLogicalHeight();
   LayoutUnit previousHeight = logicalHeight();
   setLogicalHeight(beforeEdge);
 
   if (!firstChild() && !isAnonymousBlock())
     setChildrenInline(true);
 
   TextAutosizer::LayoutScope textAutosizerLayoutScope(this, &layoutScope);
 
-  bool preferredLogicalWidthsWereDirty = preferredLogicalWidthsDirty();
-
   // Reset the flag here instead of in layoutInlineChildren() in case that
   // all inline children are removed from this block.
   setContainsInlineWithOutlineAndContinuation(false);
   if (childrenInline())
     layoutInlineChildren(relayoutChildren, afterEdge);
   else
     layoutBlockChildren(relayoutChildren, layoutScope, beforeEdge, afterEdge);
 
-  bool preferredLogicalWidthsBecameDirty =
-      !preferredLogicalWidthsWereDirty && preferredLogicalWidthsDirty();
-  if (preferredLogicalWidthsBecameDirty) {
-    // The only thing that should dirty preferred widths at this point is the
-    // addition of overflow:auto scrollbars in a descendant. To avoid a
-    // potential infinite loop, run layout again with auto scrollbars frozen in
-    // their current state.
-    PaintLayerScrollableArea::FreezeScrollbarsScope freezeScrollbars;
-    return layoutBlockFlow(relayoutChildren, pageLogicalHeight, layoutScope);
-  }
-
   // Expand our intrinsic height to encompass floats.
   if (lowestFloatLogicalBottom() > (logicalHeight() - afterEdge) &&
       createsNewFormattingContext())
     setLogicalHeight(lowestFloatLogicalBottom() + afterEdge);
 
   if (LayoutMultiColumnFlowThread* flowThread = multiColumnFlowThread()) {
     if (flowThread->columnHeightsChanged()) {
       setChildNeedsLayout(MarkOnlyThis);
       return false;
     }
@@ skipping 3979 matching lines @@
   return LayoutBlock::invalidatePaintIfNeeded(paintInvalidationState);
 }
 
 void LayoutBlockFlow::invalidateDisplayItemClients(
     PaintInvalidationReason invalidationReason) const {
   BlockFlowPaintInvalidator(*this).invalidateDisplayItemClients(
       invalidationReason);
 }
 
 }  // namespace blink