Use MessageLoopProxy for network message loop.

remoting/host/chromoting_host_context.h

Index: remoting/host/chromoting_host_context.h
diff --git a/remoting/host/chromoting_host_context.h b/remoting/host/chromoting_host_context.h
index 65c23edb510c93b153782afb3b060798ba6cdd20..0bd0f62d15322bf3e9c4baaf11cebf774b0325c2 100644
--- a/remoting/host/chromoting_host_context.h
+++ b/remoting/host/chromoting_host_context.h
@@ -44,7 +44,7 @@ class ChromotingHostContext {
 
   virtual MessageLoop* main_message_loop();
   virtual MessageLoop* encode_message_loop();
-  virtual MessageLoop* network_message_loop();
+  virtual base::MessageLoopProxy* network_message_loop();
   virtual MessageLoop* desktop_message_loop();
 
   // Must be called from the main GUI thread.
@@ -62,6 +62,7 @@ class ChromotingHostContext {
 
   // A thread that hosts all network operations.
   JingleThread jingle_thread_;
+  scoped_refptr<base::MessageLoopProxy> network_message_loop_;
 
   // A thread that hosts ChromotingHost and performs rate control.
   base::Thread main_thread_;