Remove unused TextTrack virtual functions

Source/core/html/track/InbandTextTrack.cpp

 /*
  * Copyright (C) 2012 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 74 matching lines @@
     if (mode == TextTrack::disabledKeyword())
         m_private->setMode(InbandTextTrackPrivate::Disabled);
     else if (mode == TextTrack::hiddenKeyword())
         m_private->setMode(InbandTextTrackPrivate::Hidden);
     else if (mode == TextTrack::showingKeyword())
         m_private->setMode(InbandTextTrackPrivate::Showing);
     else
         ASSERT_NOT_REACHED();
 }
 
-bool InbandTextTrack::isClosedCaptions() const
-{
-    if (!m_private)
-        return false;
-
-    return m_private->isClosedCaptions();
-}
-
-bool InbandTextTrack::containsOnlyForcedSubtitles() const
-{
-    if (!m_private)
-        return false;
-
-    return m_private->containsOnlyForcedSubtitles();
-}
-
-bool InbandTextTrack::isMainProgramContent() const
-{
-    if (!m_private)
-        return false;
-
-    return m_private->isMainProgramContent();
-}
-
-bool InbandTextTrack::isEasyToRead() const
-{
-    if (!m_private)
-        return false;
-
-    return m_private->isEasyToRead();
-}
-
 size_t InbandTextTrack::inbandTrackIndex()
 {
     ASSERT(m_private);
     return m_private->textTrackIndex();
 }
 
 void InbandTextTrack::trackRemoved()
 {
     ASSERT(m_private);
     m_private->setClient(0);
     m_private = 0;
     clearClient();
 }
 
 void InbandTextTrack::addWebVTTCue(InbandTextTrackPrivate* trackPrivate, double start, double end, const String& id, const String& content, const String& settings)
 {
     ASSERT_UNUSED(trackPrivate, trackPrivate == m_private);
 
     RefPtr<TextTrackCue> cue = TextTrackCue::create(document(), start, end, content);
     cue->setId(id);
     cue->setCueSettings(settings);
 
     if (hasCue(cue.get()))
         return;
 
     addCue(cue);
 }
 
 } // namespace WebCore