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

media/blink/webmediaplayer_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_WEBMEDIAPLAYER_IMPL_H_
 #define MEDIA_BLINK_WEBMEDIAPLAYER_IMPL_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 292 matching lines @@
 
   // Video rendering members.
   scoped_refptr<base::SingleThreadTaskRunner> compositor_task_runner_;
   VideoFrameCompositor* compositor_;  // Deleted on |compositor_task_runner_|.
   SkCanvasVideoRenderer skcanvas_video_renderer_;
 
   // The compositor layer for displaying the video content when using composited
   // playback.
   scoped_ptr<cc_blink::WebLayerImpl> video_weblayer_;
 
-  // Text track objects get a unique index value when they're created.
-  int text_track_index_;
-
   EncryptedMediaPlayerSupport encrypted_media_support_;
 
   const AudioHardwareConfig& audio_hardware_config_;
 
   scoped_ptr<Renderer> renderer_;
 
   DISALLOW_COPY_AND_ASSIGN(WebMediaPlayerImpl);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BLINK_WEBMEDIAPLAYER_IMPL_H_