Make RareNonInheritedData use MemberCopy and DataEquivalent.

third_party/WebKit/Source/core/style/DataEquivalency.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef DataEquivalency_h
 #define DataEquivalency_h
 
 #include <memory>
 #include "platform/wtf/RefPtr.h"
 
 namespace blink {
 
 template <typename T>
 class Persistent;
 template <typename T>
 class Member;
+template <typename T>
+class DataRef;
+template <typename T>
+class DataPersistent;
 
 template <typename T>
 bool DataEquivalent(const T* a, const T* b) {
   if (a == b)
     return true;
   if (!a || !b)
     return false;
   return *a == *b;
 }
 
@@ skipping 10 matching lines @@
 template <typename T>
 bool DataEquivalent(const Member<T>& a, const Member<T>& b) {
   return DataEquivalent(a.Get(), b.Get());
 }
 
 template <typename T>
 bool DataEquivalent(const std::unique_ptr<T>& a, const std::unique_ptr<T>& b) {
   return DataEquivalent(a.get(), b.get());
 }
 
+// TODO(shend): Remove this once all subgroups of StyleRareNonInheritedData are
+// generated
+template <typename T>
+bool DataEquivalent(const DataRef<T>& a, const DataRef<T>& b) {
+  return DataEquivalent(a.Get(), b.Get());
+}
+
+template <typename T>
+bool DataEquivalent(const DataPersistent<T>& a, const DataPersistent<T>& b) {
+  return DataEquivalent(a.Get(), b.Get());
+}
+
 }  // namespace blink
 
 #endif  // DataEquivalency_h