Add support for multiplexed channels in remoting::protocol::Session interface.

remoting/protocol/channel_dispatcher_base.h

Index: remoting/protocol/channel_dispatcher_base.h
diff --git a/remoting/protocol/channel_dispatcher_base.h b/remoting/protocol/channel_dispatcher_base.h
index 999b2b937fb5b056588ee9b58f8dfbe05fb1f7c4..3a663fe1e513bda4697e31d20ab2bd92465563bf 100644
--- a/remoting/protocol/channel_dispatcher_base.h
+++ b/remoting/protocol/channel_dispatcher_base.h
@@ -18,6 +18,7 @@ class StreamSocket;
 namespace remoting {
 namespace protocol {
 
+class ChannelFactory;
 class Session;
 
 // Base class for channel message dispatchers. It's responsible for
@@ -52,7 +53,7 @@ class ChannelDispatcherBase {
   void OnChannelReady(scoped_ptr<net::StreamSocket> socket);
 
   std::string channel_name_;
-  Session* session_;
+  ChannelFactory* channel_factory_;
   InitializedCallback initialized_callback_;
   scoped_ptr<net::StreamSocket> channel_;