MediaSource must use ref-counting to handle pending activity counting.

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 71 matching lines @@
 }
 
 const AtomicString& MediaSource::endedKeyword()
 {
     DEFINE_STATIC_LOCAL(const AtomicString, ended, ("ended", AtomicString::ConstructFromLiteral));
     return ended;
 }
 
 MediaSource* MediaSource::create(ExecutionContext* context)
 {
-    MediaSource* mediaSource(adoptRefCountedGarbageCollectedWillBeNoop(new MediaSource(context)));
+    MediaSource* mediaSource(adoptRefCountedGarbageCollected(new MediaSource(context)));
     mediaSource->suspendIfNeeded();
     return mediaSource;
 }
 
 MediaSource::MediaSource(ExecutionContext* context)
     : ActiveDOMObject(context)
     , m_readyState(closedKeyword())
     , m_asyncEventQueue(GenericEventQueue::create(this))
     , m_attachedElement(0)
     , m_sourceBuffers(SourceBufferList::create(executionContext(), m_asyncEventQueue.get()))
@@ skipping 437 matching lines @@
 
     m_asyncEventQueue->enqueueEvent(event.release());
 }
 
 URLRegistry& MediaSource::registry() const
 {
     return MediaSourceRegistry::registry();
 }
 
 } // namespace WebCore