Remove the index of in-band tracks on the Chromium side

media/blink/webinbandtexttrack_impl.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_BLINK_WEBINBANDTEXTTRACK_IMPL_H_
 #define MEDIA_BLINK_WEBINBANDTEXTTRACK_IMPL_H_
 
 #include "third_party/WebKit/public/platform/WebInbandTextTrack.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 
 namespace media {
 
 class WebInbandTextTrackImpl : public blink::WebInbandTextTrack {
  public:
   WebInbandTextTrackImpl(Kind kind,
                          const blink::WebString& label,
                          const blink::WebString& language,
-                         const blink::WebString& id,
-                         int index);
+                         const blink::WebString& id);
   virtual ~WebInbandTextTrackImpl();
 
   virtual void setClient(blink::WebInbandTextTrackClient* client);
   virtual blink::WebInbandTextTrackClient* client();
 
   virtual Kind kind() const;
 
   virtual blink::WebString label() const;
   virtual blink::WebString language() const;
   virtual blink::WebString id() const;
 
-  virtual int textTrackIndex() const;
-
  private:
   blink::WebInbandTextTrackClient* client_;
   Kind kind_;
   blink::WebString label_;
   blink::WebString language_;
   blink::WebString id_;
-  int index_;
   DISALLOW_COPY_AND_ASSIGN(WebInbandTextTrackImpl);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BLINK_WEBINBANDTEXTTRACK_IMPL_H_