Make Resource RefCountedWillBeGarbageCollectedFinalized, attempt #2

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 37 matching lines @@
 StyleFetchedImageSet::~StyleFetchedImageSet()
 {
 #if !ENABLE(OILPAN)
     dispose();
 #endif
 }
 
 void StyleFetchedImageSet::dispose()
 {
     m_bestFitImage->removeClient(this);
+    m_bestFitImage = nullptr;
 }
 
 WrappedImagePtr StyleFetchedImageSet::data() const
 {
     return m_bestFitImage.get();
 }
 
 ImageResource* StyleFetchedImageSet::cachedImage() const
 {
     return m_bestFitImage.get();
@@ skipping 65 matching lines @@
 }
 
 bool StyleFetchedImageSet::knownToBeOpaque(const LayoutObject* layoutObject) const
 {
     TRACE_EVENT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), "PaintImage", "data", InspectorPaintImageEvent::data(layoutObject, *m_bestFitImage.get()));
     return m_bestFitImage->image()->currentFrameKnownToBeOpaque(Image::PreCacheMetadata);
 }
 
 DEFINE_TRACE(StyleFetchedImageSet)
 {
+    visitor->trace(m_bestFitImage);
     visitor->trace(m_imageSetValue);
     StyleImage::trace(visitor);
 }
 
 } // namespace blink