Add TransportSession interface to prepare for WebRTC-based transport.

remoting/protocol/protocol_mock_objects.h

Index: remoting/protocol/protocol_mock_objects.h
diff --git a/remoting/protocol/protocol_mock_objects.h b/remoting/protocol/protocol_mock_objects.h
index ed5115f5f7e11dee250d5b2bed6fbef323eeddbb..0e65e84a5263022816781cfb0e44419709366db3 100644
--- a/remoting/protocol/protocol_mock_objects.h
+++ b/remoting/protocol/protocol_mock_objects.h
@@ -202,8 +202,7 @@ class MockSession : public Session {
 
   MOCK_METHOD1(SetEventHandler, void(Session::EventHandler* event_handler));
   MOCK_METHOD0(error, ErrorCode());
-  MOCK_METHOD0(GetTransportChannelFactory, StreamChannelFactory*());
-  MOCK_METHOD0(GetMultiplexedChannelFactory, StreamChannelFactory*());
+  MOCK_METHOD0(GetTransportSession, TransportSession*());
   MOCK_METHOD0(GetQuicChannelFactory, StreamChannelFactory*());
   MOCK_METHOD0(jid, const std::string&());
   MOCK_METHOD0(candidate_config, const CandidateSessionConfig*());