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

Source/core/css/CSSStyleDeclaration.h

Index: Source/core/css/CSSStyleDeclaration.h
diff --git a/Source/core/css/CSSStyleDeclaration.h b/Source/core/css/CSSStyleDeclaration.h
index fb8ea2db95bbebdab13c3bdb6e024660eec9d4b4..4b3829c359e5e4b0ad843f0e092b05de25dd1c80 100644
--- a/Source/core/css/CSSStyleDeclaration.h
+++ b/Source/core/css/CSSStyleDeclaration.h
@@ -24,6 +24,7 @@
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/CSSPropertyNames.h"
 #include "core/CoreExport.h"
+#include "core/css/CSSValue.h"
 #include "wtf/Forward.h"
 #include "wtf/Noncopyable.h"
 
@@ -61,11 +62,11 @@ public:
     // CSSPropertyID versions of the CSSOM functions to support bindings and editing.
     // Use the non-virtual methods in the concrete subclasses when possible.
     // The CSSValue returned by this function should not be exposed to the web as it may be used by multiple documents at the same time.
-    virtual PassRefPtrWillBeRawPtr<CSSValue> getPropertyCSSValueInternal(CSSPropertyID) = 0;
+    virtual NullableCSSValue getPropertyCSSValueInternal(CSSPropertyID) = 0;
     virtual String getPropertyValueInternal(CSSPropertyID) = 0;
     virtual void setPropertyInternal(CSSPropertyID, const String& value, bool important, ExceptionState&) = 0;
 
-    virtual bool cssPropertyMatches(CSSPropertyID, const CSSValue*) const = 0;
+    virtual bool cssPropertyMatches(CSSPropertyID, const CSSValue) const = 0;
     virtual CSSStyleSheet* parentStyleSheet() const { return 0; }
 
     DEFINE_INLINE_VIRTUAL_TRACE() { }