Use MessageLoopProxy for network message loop.

remoting/client/plugin/pepper_xmpp_proxy.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef REMOTING_CLIENT_PLUGIN_PEPPER_XMPP_PROXY_H_
 #define REMOTING_CLIENT_PLUGIN_PEPPER_XMPP_PROXY_H_
 
+#include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "remoting/jingle_glue/xmpp_proxy.h"
 
+namespace base {
+class MessageLoopProxy;
+}  // namespace base
+
 namespace remoting {
 
 class ChromotingScriptableObject;
 
 class PepperXmppProxy : public XmppProxy {
  public:
   PepperXmppProxy(
       base::WeakPtr<ChromotingScriptableObject> scriptable_object,
-      MessageLoop* callback_message_loop);
+      base::MessageLoopProxy* callback_message_loop);
 
   // Registered the callback class with this object.
   //
   // - This method has subtle thread semantics! -
   //
   // It must be called on the callback thread itself.  The weak pointer also
   // must be constructed on the callback thread.  That means, you cannot just
   // create a WeakPtr on, say the pepper thread, and then pass execution of
   // this function callback with the weak pointer bound as a parameter.  That
   // will fail because the WeakPtr will have been created on the wrong thread.
   virtual void AttachCallback(base::WeakPtr<ResponseCallback> callback);
   virtual void DetachCallback();
 
   virtual void SendIq(const std::string& request_xml);
   virtual void OnIq(const std::string& response_xml);
 
  private:
   virtual ~PepperXmppProxy();
 
   base::WeakPtr<ChromotingScriptableObject> scriptable_object_;
 
-  MessageLoop* callback_message_loop_;
+  scoped_refptr<base::MessageLoopProxy> callback_message_loop_;
 
   // Must only be access on callback_message_loop_.
   base::WeakPtr<ResponseCallback> callback_;
 
   DISALLOW_COPY_AND_ASSIGN(PepperXmppProxy);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_CLIENT_PLUGIN_PEPPER_XMPP_PROXY_H_