Remove webrtc/stream.h and unutilized inheritance.

webrtc/video/video_send_stream.h

Index: webrtc/video/video_send_stream.h
diff --git a/webrtc/video/video_send_stream.h b/webrtc/video/video_send_stream.h
index ad438ae0cb47580a7a3cba1d346b8965372e81ec..51e4e31630a000fd63118e434ce33e196d5b3c05 100644
--- a/webrtc/video/video_send_stream.h
+++ b/webrtc/video/video_send_stream.h
@@ -62,13 +62,13 @@ class VideoSendStream : public webrtc::VideoSendStream,
 
   ~VideoSendStream() override;
 
-  // webrtc::SendStream implementation.
+  void SignalNetworkState(NetworkState state);
+
+  // webrtc::VideoSendStream implementation.
   void Start() override;
   void Stop() override;
-  void SignalNetworkState(NetworkState state) override;
   bool DeliverRtcp(const uint8_t* packet, size_t length) override;
 
-  // webrtc::VideoSendStream implementation.
   VideoCaptureInput* Input() override;
   void ReconfigureVideoEncoder(const VideoEncoderConfig& config) override;
   Stats GetStats() override;