Make RareNonInheritedData use MemberCopy and DataEquivalent.

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

Index: third_party/WebKit/Source/core/style/DataEquivalency.h
diff --git a/third_party/WebKit/Source/core/style/DataEquivalency.h b/third_party/WebKit/Source/core/style/DataEquivalency.h
index 495119165744fd712a2a83ba9b1d11d212dca501..2308e3c0101d2d03ee13cb55b373deb19d4000a9 100644
--- a/third_party/WebKit/Source/core/style/DataEquivalency.h
+++ b/third_party/WebKit/Source/core/style/DataEquivalency.h
@@ -14,6 +14,10 @@ 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) {
@@ -44,6 +48,18 @@ 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