Fix race condition disconnecting hosts.

remoting/host/local_input_monitor_thread_linux.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 LOCAL_INPUT_MONITOR_THREAD_LINUX_H_
 #define LOCAL_INPUT_MONITOR_THREAD_LINUX_H_
 
 #include "base/compiler_specific.h"
+#include "base/memory/ref_counted.h"
 #include "base/threading/simple_thread.h"
 #include "third_party/skia/include/core/SkPoint.h"
 
 typedef struct _XDisplay Display;
 
 namespace remoting {
 
 class ChromotingHost;
 
 class LocalInputMonitorThread : public base::SimpleThread {
  public:
   explicit LocalInputMonitorThread(ChromotingHost* host);
   virtual ~LocalInputMonitorThread();
 
   void Stop();
   virtual void Run() OVERRIDE;
 
   void LocalMouseMoved(const SkIPoint& pos);
   void LocalKeyPressed(int key_code, bool down);
 
  private:
-  ChromotingHost* host_;
+  scoped_refptr<ChromotingHost> host_;
   int wakeup_pipe_[2];
   Display* display_;
   bool alt_pressed_;
   bool ctrl_pressed_;
 
   DISALLOW_COPY_AND_ASSIGN(LocalInputMonitorThread);
 };
 
 }  // namespace remoting
 
 #endif