Remove MEDIA_SOURCE feature define.

Source/WebCore/Modules/mediasource/SourceBufferList.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 SourceBufferList_h
 #define SourceBufferList_h
 
-#if ENABLE(MEDIA_SOURCE)
-
 #include "EventTarget.h"
 #include <wtf/RefCounted.h>
 #include <wtf/Vector.h>
 
 namespace WebCore {
 
 class SourceBuffer;
 class GenericEventQueue;
 
 class SourceBufferList : public RefCounted<SourceBufferList>, public EventTarget {
@@ skipping 33 matching lines @@
     EventTargetData m_eventTargetData;
     ScriptExecutionContext* m_scriptExecutionContext;
     GenericEventQueue* m_asyncEventQueue;
 
     Vector<RefPtr<SourceBuffer> > m_list;
 };
 
 } // namespace WebCore
 
 #endif
-#endif