CSSValue Immediates: Change CSSValue to an object instead of a pointer

Source/core/css/CSSValueTestHelper.h

 /*
  * Copyright (c) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 50 matching lines @@
     return a.equals(b);
 }
 
 inline void PrintTo(const CSSValue& cssValue, ::std::ostream* os, const char* typeName = "CSSValue")
 {
     *os << typeName << "(" << cssValue.cssText().utf8().data() << ")";
 }
 
 inline void PrintTo(const CSSPrimitiveValue& cssValue, ::std::ostream* os, const char* typeName = "CSSPrimitiveValue")
 {
-    PrintTo(static_cast<const CSSValue&>(cssValue), os, typeName);
+    PrintTo(cssValue, os, typeName);
 }
 
 }
 
 #endif