Change ContentData::operator== to iterate through whole list.

third_party/WebKit/Source/core/style/StyleRareNonInheritedData.cpp

 /*
  * Copyright (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 274 matching lines @@
              o.requires_accelerated_compositing_for_external_reasons_ &&
          has_inline_transform_ == o.has_inline_transform_ &&
          resize_ == o.resize_ &&
          has_compositor_proxy_ == o.has_compositor_proxy_ &&
          has_author_background_ == o.has_author_background_ &&
          has_author_border_ == o.has_author_border_;
 }
 
 bool StyleRareNonInheritedData::ContentDataEquivalent(
     const StyleRareNonInheritedData& o) const {
-  ContentData* a = content_.Get();
-  ContentData* b = o.content_.Get();
-
-  while (a && b && *a == *b) {
-    a = a->Next();
-    b = b->Next();
-  }
-
-  return !a && !b;
+  return DataEquivalent(content_, o.content_);
 }
 
 bool StyleRareNonInheritedData::CounterDataEquivalent(
     const StyleRareNonInheritedData& o) const {
   return DataEquivalent(counter_directives_, o.counter_directives_);
 }
 
 bool StyleRareNonInheritedData::ShadowDataEquivalent(
     const StyleRareNonInheritedData& o) const {
   return DataEquivalent(box_shadow_, o.box_shadow_);
@@ skipping 30 matching lines @@
     const StyleRareNonInheritedData& o) const {
   return DataEquivalent(shape_outside_, o.shape_outside_);
 }
 
 bool StyleRareNonInheritedData::ClipPathDataEquivalent(
     const StyleRareNonInheritedData& o) const {
   return DataEquivalent(clip_path_, o.clip_path_);
 }
 
 }  // namespace blink