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

Source/core/style/StyleFetchedImage.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 23 matching lines @@
 class ImageResource;
 
 class StyleFetchedImage final : public StyleImage, private ImageResourceClient {
     WTF_MAKE_FAST_ALLOCATED(StyleFetchedImage);
 public:
     static PassRefPtr<StyleFetchedImage> create(ImageResource* image, Document* document) { return adoptRef(new StyleFetchedImage(image, document)); }
     virtual ~StyleFetchedImage();
 
     virtual WrappedImagePtr data() const override { return m_image.get(); }
 
-    virtual PassRefPtrWillBeRawPtr<CSSValue> cssValue() const override;
+    virtual NullableCSSValue cssValue() const override;
 
     virtual bool canRender(const LayoutObject&, float multiplier) const override;
     virtual bool isLoaded() const override;
     virtual bool errorOccurred() const override;
     virtual LayoutSize imageSize(const LayoutObject*, float multiplier) const override;
     virtual bool imageHasRelativeWidth() const override;
     virtual bool imageHasRelativeHeight() const override;
     virtual void computeIntrinsicDimensions(const LayoutObject*, Length& intrinsicWidth, Length& intrinsicHeight, FloatSize& intrinsicRatio) override;
     virtual bool usesImageContainerSize() const override;
     virtual void setContainerSizeForLayoutObject(const LayoutObject*, const IntSize&, float) override;
     virtual void addClient(LayoutObject*) override;
     virtual void removeClient(LayoutObject*) override;
     virtual void notifyFinished(Resource*) override;
     virtual PassRefPtr<Image> image(LayoutObject*, const IntSize&) const override;
     virtual bool knownToBeOpaque(const LayoutObject*) const override;
     virtual ImageResource* cachedImage() const override { return m_image.get(); }
 
 private:
     StyleFetchedImage(ImageResource*, Document*);
 
     ResourcePtr<ImageResource> m_image;
     RawPtrWillBePersistent<Document> m_document;
 };
 
 DEFINE_STYLE_IMAGE_TYPE_CASTS(StyleFetchedImage, isImageResource());
 
 }
 #endif