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

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

Index: third_party/WebKit/Source/core/style/StyleRareNonInheritedData.cpp
diff --git a/third_party/WebKit/Source/core/style/StyleRareNonInheritedData.cpp b/third_party/WebKit/Source/core/style/StyleRareNonInheritedData.cpp
index 362043eaef4ce14a27f1230d8c8800fe2f6e0c19..0f4b1c77d1c1b4279c6cb42a0ef334120c6dc371 100644
--- a/third_party/WebKit/Source/core/style/StyleRareNonInheritedData.cpp
+++ b/third_party/WebKit/Source/core/style/StyleRareNonInheritedData.cpp
@@ -292,15 +292,7 @@ bool StyleRareNonInheritedData::operator==(
 
 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(