Document* -> Document& for loadSubimages and friends.

third_party/WebKit/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 19 matching lines @@
 
 namespace blink {
 
 class Document;
 class ImageResource;
 
 class StyleFetchedImage final : public StyleImage, private ResourceClient {
     USING_PRE_FINALIZER(StyleFetchedImage, dispose);
     USING_GARBAGE_COLLECTED_MIXIN(StyleFetchedImage);
 public:
-    static StyleFetchedImage* create(ImageResource* image, Document* document, const KURL& url)
+    static StyleFetchedImage* create(ImageResource* image, const Document& document, const KURL& url)
     {
         return new StyleFetchedImage(image, document, url);
     }
     ~StyleFetchedImage() override;
 
     WrappedImagePtr data() const override;
 
     CSSValue* cssValue() const override;
     CSSValue* computedCSSValue() const override;
 
     bool canRender() const override;
     bool isLoaded() const override;
     bool errorOccurred() const override;
     LayoutSize imageSize(const LayoutObject&, float multiplier, const LayoutSize& defaultObjectSize) const override;
     bool imageHasRelativeSize() const override;
     bool usesImageContainerSize() const override;
     void addClient(LayoutObject*) override;
     void removeClient(LayoutObject*) override;
     void notifyFinished(Resource*) override;
     String debugName() const override { return "StyleFetchedImage"; }
     PassRefPtr<Image> image(const LayoutObject&, const IntSize&, float zoom) const override;
     bool knownToBeOpaque(const LayoutObject&) const override;
     ImageResource* cachedImage() const override;
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
-    StyleFetchedImage(ImageResource*, Document*, const KURL&);
+    StyleFetchedImage(ImageResource*, const Document&, const KURL&);
 
     void dispose();
 
     Member<ImageResource> m_image;
-    Member<Document> m_document;
+    Member<const Document> m_document;
     const KURL m_url;
 };
 
 DEFINE_STYLE_IMAGE_TYPE_CASTS(StyleFetchedImage, isImageResource());
 
 } // namespace blink
 #endif