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

Source/core/style/StyleImage.h

Index: Source/core/style/StyleImage.h
diff --git a/Source/core/style/StyleImage.h b/Source/core/style/StyleImage.h
index c032a602539f4ee1608b0c14161833e7403b150e..3257d004a73f725d5ef25f95a5b6722f033a2e58 100644
--- a/Source/core/style/StyleImage.h
+++ b/Source/core/style/StyleImage.h
@@ -49,7 +49,7 @@ public:
         return data() == other.data();
     }
 
-    virtual PassRefPtrWillBeRawPtr<CSSValue> cssValue() const = 0;
+    virtual CSSValue cssValue() const = 0;
 
     virtual bool canRender(const LayoutObject&, float /*multiplier*/) const { return true; }
     virtual bool isLoaded() const { return true; }