Remove MEDIA_SOURCE feature define.

Source/WebCore/platform/graphics/SourceBufferPrivate.h

 /*
  * 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 12 matching lines @@
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * 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 SourceBufferPrivate_h
 #define SourceBufferPrivate_h
 
-#if ENABLE(MEDIA_SOURCE)
-
 #include "TimeRanges.h"
 
 namespace WebCore {
 
 class SourceBufferPrivate {
 public:
     SourceBufferPrivate() { }
     virtual ~SourceBufferPrivate() { }
 
     virtual PassRefPtr<TimeRanges> buffered() = 0;
     virtual void append(const unsigned char* data, unsigned length) = 0;
     virtual void abort() = 0;
     virtual bool setTimestampOffset(double) = 0;
     virtual void removedFromMediaSource() = 0;
 };
 
 }
 
 #endif
-#endif