Do not use inbandTrackIndex() when assigning track index

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 66 matching lines @@
 {
 #if ENABLE(OILPAN)
     if (m_webTrack)
         m_webTrack->setClient(0);
 #else
     // Make sure m_webTrack was cleared by trackRemoved() before destruction.
     ASSERT(!m_webTrack);
 #endif
 }
 
-size_t InbandTextTrack::inbandTrackIndex()
-{
-    ASSERT(m_webTrack);
-    return m_webTrack->textTrackIndex();
-}
-
 void InbandTextTrack::setTrackList(TextTrackList* trackList)
 {
     TextTrack::setTrackList(trackList);
     if (trackList)
         return;
 
     ASSERT(m_webTrack);
     m_webTrack->setClient(0);
     m_webTrack = 0;
 }
 
 void InbandTextTrack::addWebVTTCue(double start, double end, const WebString& id, const WebString& content, const WebString& settings)
 {
     HTMLMediaElement* owner = mediaElement();
     ASSERT(owner);
     RefPtrWillBeRawPtr<VTTCue> cue = VTTCue::create(owner->document(), start, end, content);
     cue->setId(id);
     cue->parseSettings(settings);
     addCue(cue);
 }
 
 } // namespace blink