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

Source/core/platform/graphics/MediaPlayer.cpp

 /*
  * 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 29 matching lines @@
 #include "Settings.h"
 #include "TimeRanges.h"
 #include <wtf/text/CString.h>
 
 #include "InbandTextTrackPrivate.h"
 
 #if ENABLE(MEDIA_SOURCE)
 #include "MediaSource.h"
 #endif
 
-#if USE(GSTREAMER)
-#include "MediaPlayerPrivateGStreamer.h"
-#define PlatformMediaEngineClassName MediaPlayerPrivateGStreamer
-#endif
-
 #include "MediaPlayerPrivateChromium.h"
 #define PlatformMediaEngineClassName MediaPlayerPrivate
 
 namespace WebCore {
 
 const PlatformMedia NoPlatformMedia = { PlatformMedia::None, {0} };
 
 // a null player to make MediaPlayer logic simpler
 
 class NullMediaPlayerPrivate : public MediaPlayerPrivateInterface {
@@ skipping 940 matching lines @@
 {
     return m_private->textTrackMenu();
 }
 #endif // USE(PLATFORM_TEXT_TRACK_MENU)
 
 void MediaPlayer::resetMediaEngines()
 {
     installedMediaEngines(ResetEngines);
 }
 
-#if USE(GSTREAMER)
-void MediaPlayer::simulateAudioInterruption()
-{
-    if (!m_private)
-        return;
-
-    m_private->simulateAudioInterruption();
-}
-#endif
-
 }
 
 #endif