Move Image ownership out of CSSValue

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 19 matching lines @@
 #include "core/fetch/ImageResource.h"
 #include "core/layout/LayoutObject.h"
 
 namespace blink {
 
 StyleFetchedImageSet::StyleFetchedImageSet(ImageResource* image, float imageScaleFactor, CSSImageSetValue* value)
     : m_bestFitImage(image)
     , m_imageScaleFactor(imageScaleFactor)
     , m_imageSetValue(value)
 {
+    printf("%p: StyleFetchedImageSet created\n", this);
     m_isImageResourceSet = true;
     m_bestFitImage->addClient(this);
 }
 
 
 StyleFetchedImageSet::~StyleFetchedImageSet()
 {
     m_bestFitImage->removeClient(this);
 }
 
@@ skipping 69 matching lines @@
     return m_bestFitImage->currentFrameKnownToBeOpaque(layoutObject);
 }
 
 DEFINE_TRACE(StyleFetchedImageSet)
 {
     visitor->trace(m_imageSetValue);
     StyleImage::trace(visitor);
 }
 
 } // namespace blink