Add remoting::protocol::NetworkStateObserver interface.

remoting/protocol/webrtc_video_stream.h

Index: remoting/protocol/webrtc_video_stream.h
diff --git a/remoting/protocol/webrtc_video_stream.h b/remoting/protocol/webrtc_video_stream.h
index fc0177083330d8eb128c276bcd855807d886dd1c..3f96c010c82e4da37b89c5cb4a65d391139a437f 100644
--- a/remoting/protocol/webrtc_video_stream.h
+++ b/remoting/protocol/webrtc_video_stream.h
@@ -75,9 +75,6 @@ class WebrtcVideoStream : public VideoStream,
       std::unique_ptr<WebrtcVideoStream::FrameTimestamps> timestamps);
   void OnFrameEncoded(EncodedFrameWithTimestamps frame);
 
-  void SetKeyFrameRequest();
-  void SetTargetBitrate(int bitrate);
-
   // Capturer used to capture the screen.
   std::unique_ptr<webrtc::DesktopCapturer> capturer_;
   // Used to send across encoded frames.
@@ -100,8 +97,6 @@ class WebrtcVideoStream : public VideoStream,
 
   std::unique_ptr<WebrtcFrameScheduler> scheduler_;
 
-  bool received_first_frame_request_ = false;
-
   webrtc::DesktopSize frame_size_;
   webrtc::DesktopVector frame_dpi_;
   Observer* observer_ = nullptr;