Remove unused code behind USE(PLATFORM_TEXT_TRACK_MENU)

Source/core/html/track/TextTrack.cpp

 /*
  * Copyright (C) 2011 Google Inc.  All rights reserved.
  * Copyright (C) 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 464 matching lines @@
         if (cue->startTime() < existingCue->startTime() || (cue->startTime() == existingCue->startTime() && cue->endTime() > existingCue->endTime()))
             searchEnd = index;
         else
             searchStart = index + 1;
     }
     
     ASSERT_NOT_REACHED();
     return false;
 }
 
-#if USE(PLATFORM_TEXT_TRACK_MENU)
-PassRefPtr<PlatformTextTrack> TextTrack::platformTextTrack()
-{
-    if (m_platformTextTrack)
-        return m_platformTextTrack;
-
-    PlatformTextTrack::TrackKind kind = PlatformTextTrack::Caption;
-    if (m_kind == subtitlesKeyword())
-        kind = PlatformTextTrack::Subtitle;
-    else if (m_kind == captionsKeyword())
-        kind = PlatformTextTrack::Caption;
-    else if (m_kind == descriptionsKeyword())
-        kind = PlatformTextTrack::Description;
-    else if (m_kind == chaptersKeyword())
-        kind = PlatformTextTrack::Chapter;
-    else if (m_kind == metadataKeyword())
-        kind = PlatformTextTrack::MetaData;
-
-    PlatformTextTrack::TrackType type = PlatformTextTrack::OutOfBand;
-    if (m_trackType == TrackElement)
-        type = PlatformTextTrack::OutOfBand;
-    else if (m_trackType == AddTrack)
-        type = PlatformTextTrack::Script;
-    else if (m_trackType == InBand)
-        type = PlatformTextTrack::InBand;
-
-    m_platformTextTrack = PlatformTextTrack::create(this, m_label, m_language, kind, type);
-
-    return m_platformTextTrack;
-}
-#endif
-
 bool TextTrack::isMainProgramContent() const
 {
     // "Main program" content is intrinsic to the presentation of the media file, regardless of locale. Content such as
     // directors commentary is not "main program" because it is not essential for the presentation. HTML5 doesn't have
     // a way to express this in a machine-reable form, it is typically done with the track label, so we assume that caption
     // tracks are main content and all other track types are not.
     return m_kind == captionsKeyword();
 }
 
 } // namespace WebCore