Add PluginMessageLoopProxy and use it for Host plugin UI thread.

remoting/jingle_glue/jingle_thread.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_JINGLE_GLUE_JINGLE_THREAD_H_
 #define REMOTING_JINGLE_GLUE_JINGLE_THREAD_H_
 
 #include "base/message_loop.h"
 #include "base/tracked_objects.h"
 #include "base/synchronization/waitable_event.h"
 #include "third_party/libjingle/source/talk/base/messagequeue.h"
 #include "third_party/libjingle/source/talk/base/taskrunner.h"
 #include "third_party/libjingle/source/talk/base/thread.h"
 
-namespace base {
-class MessageLoopProxy;
-}  // namespace base
-
 namespace buzz {
 class XmppClient;
-}  // namespace buzz
+}
 
 namespace remoting {
 
 class TaskPump : public talk_base::MessageHandler,
                  public talk_base::TaskRunner {
  public:
   TaskPump();
 
   // TaskRunner methods.
   virtual void WakeTasks();
@@ skipping 21 matching lines @@
 
   void Start();
 
   // Main function for the thread. Should not be called directly.
   virtual void Run();
 
   // Stop the thread.
   virtual void Stop();
 
   // Returns Chromiums message loop for this thread.
+  // TODO(sergeyu): remove this method when we use base::Thread instead of
+  // talk_base::Thread
   MessageLoop* message_loop();
-  base::MessageLoopProxy* message_loop_proxy();
 
   // Returns task pump if the thread is running, otherwise NULL is returned.
   TaskPump* task_pump();
 
  private:
   TaskPump* task_pump_;
   base::WaitableEvent started_event_;
   base::WaitableEvent stopped_event_;
   MessageLoop* message_loop_;
-  scoped_refptr<base::MessageLoopProxy> message_loop_proxy_;
 
   DISALLOW_COPY_AND_ASSIGN(JingleThread);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_JINGLE_GLUE_JINGLE_THREAD_H_