Make Image::image_observer_ WeakPersistent

third_party/WebKit/Source/core/svg/graphics/SVGImageChromeClient.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
@@ skipping 96 matching lines @@
 void SVGImageChromeClient::SetTimer(std::unique_ptr<TimerBase> timer) {
   animation_timer_ = std::move(timer);
 }
 
 void SVGImageChromeClient::AnimationTimerFired(TimerBase*) {
   if (!image_)
     return;
 
   // The SVGImageChromeClient object's lifetime is dependent on
   // the ImageObserver (an ImageResourceContent) of its image. Should it
-  // be dead and about to be lazily swept out, do not proceed.
+  // be dead and about to be lazily swept out, then GetImageObserver()
+  // becomes null and we do not proceed.
   //
   // TODO(Oilpan): move (SVG)Image to the Oilpan heap, and avoid
   // this explicit lifetime check.
-  if (ThreadHeap::WillObjectBeLazilySwept(image_->GetImageObserver()))
+  if (!image_->GetImageObserver())
     return;
 
   image_->ServiceAnimations(MonotonicallyIncreasingTime());
 }
 
 }  // namespace blink