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 475b58e56a04a5ebdcc00f2f31bb4cf31793fd67..fb16b67aaa718d9a033c6e70589bffb23db44cff 100644
--- a/webrtc/video/video_send_stream.h
+++ b/webrtc/video/video_send_stream.h
@@ -63,13 +63,12 @@ class VideoSendStream : public webrtc::VideoSendStream,
 
   ~VideoSendStream() override;
 
-  // webrtc::SendStream implementation.
-  void Start() override;
-  void Stop() override;
-  void SignalNetworkState(NetworkState state) override;
-  bool DeliverRtcp(const uint8_t* packet, size_t length) override;
+  void SignalNetworkState(NetworkState state);
+  bool DeliverRtcp(const uint8_t* packet, size_t length);
 
   // webrtc::VideoSendStream implementation.
+  void Start() override;
+  void Stop() override;
   VideoCaptureInput* Input() override;
   void ReconfigureVideoEncoder(const VideoEncoderConfig& config) override;
   Stats GetStats() override;