Revert 124780 - Create a MediaSource object.

Source/WebCore/dom/EventTarget.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  *           (C) 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ skipping 38 matching lines @@
     class EventSource;
     class FileReader;
     class FileWriter;
     class IDBDatabase;
     class IDBRequest;
     class IDBTransaction;
     class IDBVersionChangeRequest;
     class JavaScriptAudioNode;
     class LocalMediaStream;
     class MediaController;
-    class MediaSource;
     class MediaStream;
     class MessagePort;
     class Node;
     class Notification;
     class SVGElementInstance;
     class ScriptExecutionContext;
     class SharedWorker;
     class SharedWorkerContext;
     class SourceBufferList;
     class TextTrack;
@@ skipping 144 matching lines @@
     {
         EventTargetData* d = eventTargetData();
         if (!d)
             return false;
         return d->eventListenerMap.contains(eventType);
     }
 
 } // namespace WebCore
 
 #endif // EventTarget_h