Remove USE(GSTREAMER) and USE(WEBAUDIO_GSTREAMER) guards.

Source/core/platform/graphics/MediaPlayer.h

 /*
  * Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 404 matching lines @@
     bool requiresTextTrackRepresentation() const;
     void setTextTrackRepresentation(TextTrackRepresentation*);
 
     static void resetMediaEngines();
 
 #if USE(PLATFORM_TEXT_TRACK_MENU)
     bool implementsTextTrackControls() const;
     PassRefPtr<PlatformTextTrackMenuInterface> textTrackMenu();
 #endif
 
-#if USE(GSTREAMER)
-    virtual void simulateAudioInterruption();
-#endif
-
 private:
     MediaPlayer(MediaPlayerClient*);
     void loadWithNextMediaEngine(MediaPlayerFactory*);
     void reloadTimerFired(Timer<MediaPlayer>*);
 
     static void initializeMediaEngines();
 
     MediaPlayerClient* m_mediaPlayerClient;
     Timer<MediaPlayer> m_reloadTimer;
     OwnPtr<MediaPlayerPrivateInterface> m_private;
@@ skipping 28 matching lines @@
 typedef void (*MediaEngineClearMediaCacheForSite)(const String&);
 
 typedef void (*MediaEngineRegistrar)(CreateMediaEnginePlayer, MediaEngineSupportedTypes, MediaEngineSupportsType,
     MediaEngineGetSitesInMediaCache, MediaEngineClearMediaCache, MediaEngineClearMediaCacheForSite);
 
 }
 
 #endif // ENABLE(VIDEO)
 
 #endif