Rename video streams' start/stop methods.

{Start,Stop}{Send,Receive}() -> {Start,Stop}{Sending,Receiving}().

BUG=
R=mflodman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/3609005

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@5136 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/video_receive_stream.h b/video_receive_stream.h
index f968c66..8b4f643 100644
--- a/video_receive_stream.h
+++ b/video_receive_stream.h
@@ -164,8 +164,8 @@
     StatsCallback* stats_callback;
   };
 
-  virtual void StartReceive() = 0;
-  virtual void StopReceive() = 0;
+  virtual void StartReceiving() = 0;
+  virtual void StopReceiving() = 0;
 
   // TODO(mflodman) Replace this with callback.
   virtual void GetCurrentReceiveCodec(VideoCodec* receive_codec) = 0;