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

remoting/protocol/protobuf_video_reader.cc

Index: remoting/protocol/protobuf_video_reader.cc
diff --git a/remoting/protocol/protobuf_video_reader.cc b/remoting/protocol/protobuf_video_reader.cc
index 0bcc9fe9b354129c2351177a0a635c12c8e17201..07f6035638dd79870864095014ab35a235b20f5d 100644
--- a/remoting/protocol/protobuf_video_reader.cc
+++ b/remoting/protocol/protobuf_video_reader.cc
@@ -37,6 +37,10 @@ void ProtobufVideoReader::Init(protocol::Session* session,
       base::Bind(&ProtobufVideoReader::OnChannelReady, base::Unretained(this)));
 }
 
+bool ProtobufVideoReader::is_connected() {
+  return channel_.get() != NULL;
+}
+
 void ProtobufVideoReader::OnChannelReady(net::StreamSocket* socket) {
   if (!socket) {
     initialized_callback_.Run(false);