ReAdd dummy MediaStreamTrack::set_state to make Chrome build happy.

webrtc/api/mediastreaminterface.h

 /*
  *  Copyright 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 74 matching lines @@
   };
 
   static const char kAudioKind[];
   static const char kVideoKind[];
 
   virtual std::string kind() const = 0;
   virtual std::string id() const = 0;
   virtual bool enabled() const = 0;
   virtual TrackState state() const = 0;
   virtual bool set_enabled(bool enable) = 0;
+  // TODO(perkj): Remove when Chrome tests doesn't rely on this method.
+  virtual bool set_state(TrackState state) { return true;}
 
  protected:
   virtual ~MediaStreamTrackInterface() {}
 };
 
 // VideoTrackSourceInterface is a reference counted source used for VideoTracks.
 // The same source can be used in multiple VideoTracks.
 class VideoTrackSourceInterface
     : public MediaSourceInterface,
       public rtc::VideoSourceInterface<cricket::VideoFrame> {
@@ skipping 158 matching lines @@
   virtual bool RemoveTrack(AudioTrackInterface* track) = 0;
   virtual bool RemoveTrack(VideoTrackInterface* track) = 0;
 
  protected:
   virtual ~MediaStreamInterface() {}
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_API_MEDIASTREAMINTERFACE_H_