[ImageResource 1c] Change StyleFetchedImageSet from ResourceClient to ImageResourceObserver

third_party/WebKit/Source/core/style/StyleFetchedImageSet.cpp

 /*
  * 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 23 matching lines @@
 
 StyleFetchedImageSet::StyleFetchedImageSet(ImageResource* image,
                                            float imageScaleFactor,
                                            CSSImageSetValue* value,
                                            const KURL& url)
     : m_bestFitImage(image),
       m_imageScaleFactor(imageScaleFactor),
       m_imageSetValue(value),
       m_url(url) {
   m_isImageResourceSet = true;
-  m_bestFitImage->addClient(this);
+  m_bestFitImage->addObserver(this);
   ThreadState::current()->registerPreFinalizer(this);
 }
 
 StyleFetchedImageSet::~StyleFetchedImageSet() {}
 
 void StyleFetchedImageSet::dispose() {
-  m_bestFitImage->removeClient(this);
+  m_bestFitImage->removeObserver(this);
   m_bestFitImage = nullptr;
 }
 
 WrappedImagePtr StyleFetchedImageSet::data() const {
   return m_bestFitImage.get();
 }
 
 ImageResource* StyleFetchedImageSet::cachedImage() const {
   return m_bestFitImage.get();
 }
@@ skipping 70 matching lines @@
       TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), "PaintImage", "data",
       InspectorPaintImageEvent::data(&layoutObject, *m_bestFitImage.get()));
   return m_bestFitImage->getImage()->currentFrameKnownToBeOpaque(
       Image::PreCacheMetadata);
 }
 
 DEFINE_TRACE(StyleFetchedImageSet) {
   visitor->trace(m_bestFitImage);
   visitor->trace(m_imageSetValue);
   StyleImage::trace(visitor);
-  ResourceClient::trace(visitor);
 }
 
 }  // namespace blink