Remove event_channel() and control_channel() from Session interface.

remoting/protocol/rtp_video_reader.cc

Index: remoting/protocol/rtp_video_reader.cc
diff --git a/remoting/protocol/rtp_video_reader.cc b/remoting/protocol/rtp_video_reader.cc
index e5f9f8b9122efa1878dadb988b5d5da047ef9aa2..75c1ba5b33a8a57924e2a996042d339b653042eb 100644
--- a/remoting/protocol/rtp_video_reader.cc
+++ b/remoting/protocol/rtp_video_reader.cc
@@ -56,6 +56,10 @@ void RtpVideoReader::Init(protocol::Session* session,
                  base::Unretained(this), false));
 }
 
+bool RtpVideoReader::is_connected() {
+  return rtp_channel_.get() && rtcp_channel_.get();
+}
+
 void RtpVideoReader::OnChannelReady(bool rtp, net::Socket* socket) {
   if (!socket) {
     if (!initialized_) {