Oilpan: Prepare to move EventQueue and its subclasses to Oilpan heap.

Source/modules/mediasource/MediaSource.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 241 matching lines @@
     return EventTargetNames::MediaSource;
 }
 
 ExecutionContext* MediaSource::executionContext() const
 {
     return ActiveDOMObject::executionContext();
 }
 
 void MediaSource::trace(Visitor* visitor)
 {
+    visitor->trace(m_asyncEventQueue);
     visitor->trace(m_sourceBuffers);
     visitor->trace(m_activeSourceBuffers);
     EventTargetWithInlineData::trace(visitor);
 }
 
 void MediaSource::setWebMediaSourceAndOpen(PassOwnPtr<WebMediaSource> webMediaSource)
 {
     TRACE_EVENT_ASYNC_END0("media", "MediaSource::attachToElement", this);
     ASSERT(webMediaSource);
     ASSERT(!m_webMediaSource);
@@ skipping 244 matching lines @@
 
     m_asyncEventQueue->enqueueEvent(event.release());
 }
 
 URLRegistry& MediaSource::registry() const
 {
     return MediaSourceRegistry::registry();
 }
 
 } // namespace WebCore