CC AnimationHost: Fix LinkHighlights detach scope.

third_party/WebKit/Source/web/LinkHighlightImpl.cpp

 /*
  * Copyright (C) 2012 Google 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 84 matching lines @@
     }
     m_contentLayer->layer()->setDrawsContent(true);
     m_contentLayer->layer()->setOpacity(1);
     m_geometryNeedsUpdate = true;
     updateGeometry();
 }
 
 LinkHighlightImpl::~LinkHighlightImpl()
 {
     if (m_compositorPlayer) {
-        m_compositorPlayer->detachLayer();
+        if (m_compositorPlayer->isLayerAttached())
+            m_compositorPlayer->detachLayer();
         if (m_owningWebViewImpl->linkHighlightsTimeline())
             m_owningWebViewImpl->linkHighlightsTimeline()->playerDestroyed(*this);
         m_compositorPlayer->setAnimationDelegate(nullptr);
     }
     m_compositorPlayer.clear();
 
     clearGraphicsLayerLinkHighlightPointer();
     releaseResources();
 }
 
@@ skipping 262 matching lines @@
 {
     return clipLayer();
 }
 
 WebCompositorAnimationPlayer* LinkHighlightImpl::compositorPlayer() const
 {
     return m_compositorPlayer.get();
 }
 
 } // namespace blink