Generate CSSPropertyEquality instead of using hand-updated file.

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 c707e4bd3c261885e1f3b5d6e8a87e736dc32a50..20efb2a60f4ec63f0fdfce67b6691bcbcc791437 100644
--- a/third_party/WebKit/Source/core/style/DataEquivalency.h
+++ b/third_party/WebKit/Source/core/style/DataEquivalency.h
@@ -44,6 +44,11 @@ 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