Shutdown the It2Me host cleanly.

remoting/host/native_messaging/native_messaging_pipe.h

 // Copyright 2014 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_HOST_NATIVE_MESSAGING_NATIVE_MESSAGING_PIPE_H_
 #define REMOTING_HOST_NATIVE_MESSAGING_NATIVE_MESSAGING_PIPE_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "extensions/browser/api/messaging/native_message_host.h"
 #include "extensions/browser/api/messaging/native_messaging_channel.h"
 
 namespace base {
 class Value;
 }
 
 namespace remoting {
 
 // Connects a extensions::NativeMessageHost to a PipeMessagingChannel.
 class NativeMessagingPipe
     : public extensions::NativeMessagingChannel::EventHandler,
       public extensions::NativeMessageHost::Client {
  public:
   NativeMessagingPipe();
   ~NativeMessagingPipe() override;
 
   // Starts processing messages from the pipe.
   void Start(scoped_ptr<extensions::NativeMessageHost> host,
-             scoped_ptr<extensions::NativeMessagingChannel> channel,
-             const base::Closure& quit_closure);
+             scoped_ptr<extensions::NativeMessagingChannel> channel);
 
   // extensions::NativeMessageHost::Client implementation.
   void PostMessageFromNativeHost(const std::string& message) override;
   void CloseChannel(const std::string& error_message) override;
 
   // extensions::NativeMessagingChannel::EventHandler implementation.
   void OnMessage(scoped_ptr<base::Value> message) override;
   void OnDisconnect() override;
 
  private:
-  base::Closure quit_closure_;
   scoped_ptr<extensions::NativeMessagingChannel> channel_;
   scoped_ptr<extensions::NativeMessageHost> host_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeMessagingPipe);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_NATIVE_MESSAGING_NATIVE_MESSAGING_PIPE_H_