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/video_send_stream.h b/video/video_send_stream.h
index 2d077e3..d0da69f 100644
--- a/video/video_send_stream.h
+++ b/video/video_send_stream.h
@@ -50,9 +50,9 @@
 
   virtual VideoSendStreamInput* Input() OVERRIDE;
 
-  virtual void StartSend() OVERRIDE;
+  virtual void StartSending() OVERRIDE;
 
-  virtual void StopSend() OVERRIDE;
+  virtual void StopSending() OVERRIDE;
 
   virtual bool SetCodec(const VideoCodec& codec) OVERRIDE;
   virtual VideoCodec GetCodec() OVERRIDE;