[Oilpan] Migrate most classes under core/animations to Oilpan heap.

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 92 matching lines @@
         }
         m_content->attach(this);
     }
 }
 
 AnimationPlayer::~AnimationPlayer()
 {
 #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;
@@ skipping 898 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