Oilpan: Replace most of RefPtrs for Event objects with oilpan's transition types

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 186 matching lines @@
     task->notifyEnded();
 }
 
 AudioScheduledSourceNode::NotifyEndedTask::NotifyEndedTask(PassRefPtr<AudioScheduledSourceNode> sourceNode)
     : m_scheduledNode(sourceNode)
 {
 }
 
 void AudioScheduledSourceNode::NotifyEndedTask::notifyEnded()
 {
-    RefPtr<Event> event = Event::create(EventTypeNames::ended);
+    RefPtrWillBeRawPtr<Event> event = Event::create(EventTypeNames::ended);
     event->setTarget(m_scheduledNode);
     m_scheduledNode->dispatchEvent(event.get());
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(WEB_AUDIO)