Add TransportSession interface to prepare for WebRTC-based transport.

remoting/protocol/client_video_dispatcher_unittest.cc

Index: remoting/protocol/client_video_dispatcher_unittest.cc
diff --git a/remoting/protocol/client_video_dispatcher_unittest.cc b/remoting/protocol/client_video_dispatcher_unittest.cc
index baf633949f8bd33ae0d226ef0321f85a6c6c8346..74bf7a371efe0757c978507411432141a2d09863 100644
--- a/remoting/protocol/client_video_dispatcher_unittest.cc
+++ b/remoting/protocol/client_video_dispatcher_unittest.cc
@@ -73,7 +73,8 @@ ClientVideoDispatcherTest::ClientVideoDispatcherTest()
   base::RunLoop().RunUntilIdle();
   DCHECK(initialized_);
   host_socket_.PairWith(
-      session_.fake_channel_factory().GetFakeChannel(kVideoChannelName));
+      session_.GetTransportSession()->GetStreamChannelFactory()->GetFakeChannel(
+          kVideoChannelName));
   reader_.StartReading(&host_socket_,
                        base::Bind(&ClientVideoDispatcherTest::OnReadError,
                                   base::Unretained(this)));