Remove unused implementations in WebInbandTextTrackImpl

content/renderer/media/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 CONTENT_RENDERER_MEDIA_WEBINBANDTEXTTRACK_IMPL_H_
 #define CONTENT_RENDERER_MEDIA_WEBINBANDTEXTTRACK_IMPL_H_
 
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/web/WebInbandTextTrack.h"
 
 namespace content {
 
 class WebInbandTextTrackImpl : public blink::WebInbandTextTrack {
  public:
   WebInbandTextTrackImpl(Kind kind,
                          const blink::WebString& label,
                          const blink::WebString& language,
                          int index);
   virtual ~WebInbandTextTrackImpl();
 
   virtual void setClient(blink::WebInbandTextTrackClient* client);
   virtual blink::WebInbandTextTrackClient* client();
 
-  virtual void setMode(Mode mode);
-  virtual Mode mode() const;
-
   virtual Kind kind() const;
-  virtual bool isClosedCaptions() const;
 
   virtual blink::WebString label() const;
   virtual blink::WebString language() const;
-  virtual bool isDefault() const;
 
   virtual int textTrackIndex() const;
 
  private:
   blink::WebInbandTextTrackClient* client_;
-  Mode mode_;
   Kind kind_;
   blink::WebString label_;
   blink::WebString language_;
   int index_;
   DISALLOW_COPY_AND_ASSIGN(WebInbandTextTrackImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_WEBINBANDTEXTTRACK_IMPL_H_