Remove unused code behind USE(PLATFORM_TEXT_TRACK_MENU)

Source/core/platform/graphics/MediaPlayer.h

Index: Source/core/platform/graphics/MediaPlayer.h
diff --git a/Source/core/platform/graphics/MediaPlayer.h b/Source/core/platform/graphics/MediaPlayer.h
index bb26facb1c0fed7a033bd1e7378d7cb86dec5953..874c7d9e1d0acc14e370a37beeeea0f17627cf23 100644
--- a/Source/core/platform/graphics/MediaPlayer.h
+++ b/Source/core/platform/graphics/MediaPlayer.h
@@ -38,11 +38,6 @@
 #include <wtf/PassOwnPtr.h>
 #include <wtf/text/StringHash.h>
 
-
-#if USE(PLATFORM_TEXT_TRACK_MENU)
-#include "core/platform/graphics/PlatformTextTrackMenu.h"
-#endif
-
 namespace WebCore {
 
 class AudioSourceProvider;
@@ -357,11 +352,6 @@ public:
     bool requiresTextTrackRepresentation() const;
     void setTextTrackRepresentation(TextTrackRepresentation*);
 
-#if USE(PLATFORM_TEXT_TRACK_MENU)
-    bool implementsTextTrackControls() const;
-    PassRefPtr<PlatformTextTrackMenuInterface> textTrackMenu();
-#endif
-
 private:
     MediaPlayer(MediaPlayerClient*);
     void loadWithMediaEngine();