Remove unused TextTrack virtual functions

Source/core/html/track/TextTrack.h

 /*
  * 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:
  * 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
@@ skipping 95 matching lines @@
     void removeRegion(VTTRegion*, ExceptionState&);
 
     void cueWillChange(TextTrackCue*);
     void cueDidChange(TextTrackCue*);
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(cuechange);
 
     enum TextTrackType { TrackElement, AddTrack, InBand };
     TextTrackType trackType() const { return m_trackType; }
 
-    virtual bool isClosedCaptions() const { return false; }
-
-    virtual bool containsOnlyForcedSubtitles() const { return false; }
-    virtual bool isMainProgramContent() const;
-    virtual bool isEasyToRead() const { return false; }
-
     int trackIndex();
     void invalidateTrackIndex();
 
     bool isRendered();
     int trackIndexRelativeToRenderedTracks();
 
     bool hasBeenConfigured() const { return m_hasBeenConfigured; }
     void setHasBeenConfigured(bool flag) { m_hasBeenConfigured = flag; }
 
     virtual bool isDefault() const { return false; }
@@ skipping 30 matching lines @@
     TextTrackType m_trackType;
     ReadinessState m_readinessState;
     int m_trackIndex;
     int m_renderedTrackIndex;
     bool m_hasBeenConfigured;
 };
 
 } // namespace WebCore
 
 #endif