Have Player take the DocumentTimeline object by reference

Source/core/animation/DocumentTimeline.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 45 matching lines @@
     if (!timing)
         m_timing = adoptPtr(new DocumentTimelineTiming(this));
     else
         m_timing = timing;
 
     ASSERT(document);
 }
 
 PassRefPtr<Player> DocumentTimeline::play(TimedItem* child)
 {
-    RefPtr<Player> player = Player::create(this, child);
+    RefPtr<Player> player = Player::create(*this, child);
     m_players.append(player);
 
     if (m_document->view())
         m_timing->serviceOnNextFrame();
 
     return player.release();
 }
 
 void DocumentTimeline::wake()
 {
@@ skipping 73 matching lines @@
 }
 
 size_t DocumentTimeline::numberOfActiveAnimationsForTesting() const
 {
     // Includes all players whose directly associated timed items
     // are current or in effect.
     return isNull(m_zeroTime) ? 0 : m_players.size();
 }
 
 } // namespace