Change StyleResolverState.styleImage() to take a const CSSValue&

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 28 matching lines @@
 class CSSImageSetValue : public CSSValueList {
 public:
 
     static PassRefPtrWillBeRawPtr<CSSImageSetValue> create()
     {
         return adoptRefWillBeNoop(new CSSImageSetValue());
     }
     ~CSSImageSetValue();
 
     bool isCachePending(float deviceScaleFactor) const;
-    StyleFetchedImageSet* cachedImageSet(float deviceScaleFactor);
+    StyleFetchedImageSet* cachedImageSet(float deviceScaleFactor) const;
     StyleFetchedImageSet* cacheImageSet(Document*, float deviceScaleFactor, const ResourceLoaderOptions&);
     StyleFetchedImageSet* cacheImageSet(Document*, float deviceScaleFactor);
 
     String customCSSText() const;
 
     struct ImageWithScale {
         ALLOW_ONLY_INLINE_ALLOCATION();
         String imageURL;
         Referrer referrer;
         float scaleFactor;
@@ skipping 19 matching lines @@
     RefPtrWillBeMember<StyleFetchedImageSet> m_cachedImageSet;
 
     Vector<ImageWithScale> m_imagesInSet;
 };
 
 DEFINE_CSS_VALUE_TYPE_CASTS(CSSImageSetValue, isImageSetValue());
 
 } // namespace blink
 
 #endif // CSSImageSetValue_h