Oilpan: Move the EventListener hierarchy to Oilpan's heap

Source/modules/webaudio/AudioScheduledSourceNode.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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 234 matching lines @@
 void AudioScheduledSourceNode::stop(double when, ExceptionState& exceptionState)
 {
     audioScheduledSourceHandler().stop(when, exceptionState);
 }
 
 EventListener* AudioScheduledSourceNode::onended()
 {
     return getAttributeEventListener(EventTypeNames::ended);
 }
 
-void AudioScheduledSourceNode::setOnended(PassRefPtr<EventListener> listener)
+void AudioScheduledSourceNode::setOnended(PassRefPtrWillBeRawPtr<EventListener> listener)
 {
     audioScheduledSourceHandler().setHasEndedListener();
     setAttributeEventListener(EventTypeNames::ended, listener);
 }
 
 } // namespace blink
 
 #endif // ENABLE(WEB_AUDIO)