Remove webrtc/stream.h and unutilized inheritance.

webrtc/video/video_receive_stream.h

Index: webrtc/video/video_receive_stream.h
diff --git a/webrtc/video/video_receive_stream.h b/webrtc/video/video_receive_stream.h
index a0edcac8d4049d96bb5321730f2ba19e9f5cab54..441940a4610981ca3e8196589c6182a87f7aab85 100644
--- a/webrtc/video/video_receive_stream.h
+++ b/webrtc/video/video_receive_stream.h
@@ -54,16 +54,16 @@ class VideoReceiveStream : public webrtc::VideoReceiveStream,
                      VieRemb* remb);
   ~VideoReceiveStream() override;
 
-  // webrtc::ReceiveStream implementation.
+  void SignalNetworkState(NetworkState state);
+
+  // webrtc::VideoReceiveStream implementation.
   void Start() override;
   void Stop() override;
-  void SignalNetworkState(NetworkState state) override;
   bool DeliverRtcp(const uint8_t* packet, size_t length) override;
   bool DeliverRtp(const uint8_t* packet,
                   size_t length,
                   const PacketTime& packet_time) override;
 
-  // webrtc::VideoReceiveStream implementation.
   webrtc::VideoReceiveStream::Stats GetStats() const override;
 
   // Overrides I420FrameCallback.