Remove MEDIA_SOURCE feature define.

Source/WebCore/Modules/mediasource/MediaSource.h

 /*
  * 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:
  *
  *     * 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 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef MediaSource_h
 #define MediaSource_h
 
-#if ENABLE(MEDIA_SOURCE)
-
 #include "ActiveDOMObject.h"
 #include "GenericEventQueue.h"
 #include "MediaSourcePrivate.h"
 #include "SourceBuffer.h"
 #include "SourceBufferList.h"
 #include <wtf/RefCounted.h>
 
 namespace WebCore {
 
 class MediaSource : public RefCounted<MediaSource>, public EventTarget, public ActiveDOMObject {
@@ skipping 47 matching lines @@
     OwnPtr<MediaSourcePrivate> m_private;
 
     RefPtr<SourceBufferList> m_sourceBuffers;
     RefPtr<SourceBufferList> m_activeSourceBuffers;
     OwnPtr<GenericEventQueue> m_asyncEventQueue;
 };
 
 } // namespace WebCore
 
 #endif
-#endif