Oilpan: adjust AnimationTimeline finalization.

Source/core/animation/AnimationPlayer.cpp

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 99 matching lines @@
 #if !ENABLE(OILPAN)
     if (m_content)
         m_content->detach();
     if (m_timeline)
         m_timeline->playerDestroyed(this);
 #endif
 
     destroyCompositorPlayer();
 }
 
+#if !ENABLE(OILPAN)
+void AnimationPlayer::detachFromTimeline()
+{
+    dispose();
+    m_timeline = nullptr;
+}
+#endif
+
 double AnimationPlayer::sourceEnd() const
 {
     return m_content ? m_content->endTimeInternal() : 0;
 }
 
 bool AnimationPlayer::limited(double currentTime) const
 {
     return (m_playbackRate < 0 && currentTime <= 0) || (m_playbackRate > 0 && currentTime >= sourceEnd());
 }
 
@@ skipping 885 matching lines @@
     visitor->trace(m_content);
     visitor->trace(m_timeline);
     visitor->trace(m_pendingFinishedEvent);
     visitor->trace(m_finishedPromise);
     visitor->trace(m_readyPromise);
     EventTargetWithInlineData::trace(visitor);
     ActiveDOMObject::trace(visitor);
 }
 
 } // namespace