Web Animations: Avoid leak in AnimationPlayer

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 280 matching lines @@
     return ActiveDOMObject::executionContext();
 }
 
 bool AnimationPlayer::hasPendingActivity() const
 {
     return m_pendingFinishedEvent || (!m_finished && hasEventListeners(EventTypeNames::finish));
 }
 
 void AnimationPlayer::stop()
 {
+    m_finished = true;
     m_pendingFinishedEvent = nullptr;
 }
 
 bool AnimationPlayer::dispatchEvent(PassRefPtrWillBeRawPtr<Event> event)
 {
     if (m_pendingFinishedEvent == event)
         m_pendingFinishedEvent = nullptr;
     return EventTargetWithInlineData::dispatchEvent(event);
 }
 
@@ skipping 138 matching lines @@
 
 void AnimationPlayer::trace(Visitor* visitor)
 {
     visitor->trace(m_content);
     visitor->trace(m_timeline);
     visitor->trace(m_pendingFinishedEvent);
     EventTargetWithInlineData::trace(visitor);
 }
 
 } // namespace