Generate CSSPropertyEquality instead of using hand-updated file.

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 "wtf/OwnPtr.h"
 #include "wtf/RefPtr.h"
 
@@ skipping 26 matching lines @@
 {
     return dataEquivalent(a.get(), b.get());
 }
 
 template <typename T>
 bool dataEquivalent(const OwnPtr<T>& a, const OwnPtr<T>& b)
 {
     return dataEquivalent(a.get(), b.get());
 }
 
+template <typename T>
+bool dataEquivalent(const T a, const T b)
+{
+    return a == b;
+}
 } // namespace blink
 
 #endif // DataEquivalency_h