Rename Start/Stop in Video{Send,Receive}Streams.

Rename {Start,Stop}{Sending,Receving} to Start/Stop. StartSending
provides no extra information in the context of a VideoSendStream, as
what it does is to send.

R=mflodman@webrtc.org
BUG=3227

Review URL: https://webrtc-codereview.appspot.com/12329005

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@5970 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/video/video_send_stream.cc b/video/video_send_stream.cc
index a7eebef..2680b09 100644
--- a/video/video_send_stream.cc
+++ b/video/video_send_stream.cc
@@ -210,13 +210,13 @@
 
 VideoSendStreamInput* VideoSendStream::Input() { return this; }
 
-void VideoSendStream::StartSending() {
+void VideoSendStream::Start() {
   transport_adapter_.Enable();
   video_engine_base_->StartSend(channel_);
   video_engine_base_->StartReceive(channel_);
 }
 
-void VideoSendStream::StopSending() {
+void VideoSendStream::Stop() {
   video_engine_base_->StopSend(channel_);
   video_engine_base_->StopReceive(channel_);
   transport_adapter_.Disable();