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

Source/core/style/StyleFetchedImage.h

Index: Source/core/style/StyleFetchedImage.h
diff --git a/Source/core/style/StyleFetchedImage.h b/Source/core/style/StyleFetchedImage.h
index be1d5a006930c687334d426d18a07f2ac97dbc83..8eb6954e5465da9e76d448132f668123267e13ff 100644
--- a/Source/core/style/StyleFetchedImage.h
+++ b/Source/core/style/StyleFetchedImage.h
@@ -41,7 +41,7 @@ public:
 
     virtual WrappedImagePtr data() const override { return m_image.get(); }
 
-    virtual PassRefPtrWillBeRawPtr<CSSValue> cssValue() const override;
+    virtual CSSValue cssValue() const override;
 
     virtual bool canRender(const LayoutObject&, float multiplier) const override;
     virtual bool isLoaded() const override;