Document* -> Document& for loadSubimages and friends.

third_party/WebKit/Source/core/css/CSSImageSetValue.h

 /*
  * Copyright (C) 2012 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 29 matching lines @@
 public:
 
     static CSSImageSetValue* create()
     {
         return new CSSImageSetValue();
     }
     ~CSSImageSetValue();
 
     bool isCachePending(float deviceScaleFactor) const;
     StyleImage* cachedImage(float deviceScaleFactor) const;
-    StyleImage* cacheImage(Document*, float deviceScaleFactor, CrossOriginAttributeValue = CrossOriginAttributeNotSet);
+    StyleImage* cacheImage(const Document&, float deviceScaleFactor, CrossOriginAttributeValue = CrossOriginAttributeNotSet);
 
     String customCSSText() const;
 
     struct ImageWithScale {
         DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
         String imageURL;
         Referrer referrer;
         float scaleFactor;
     };
 
@@ skipping 16 matching lines @@
     Member<StyleImage> m_cachedImage;
 
     Vector<ImageWithScale> m_imagesInSet;
 };
 
 DEFINE_CSS_VALUE_TYPE_CASTS(CSSImageSetValue, isImageSetValue());
 
 } // namespace blink
 
 #endif // CSSImageSetValue_h