Revert "Remote Assistance on Chrome OS Part III - NativeMessageHost"

chrome/browser/extensions/api/messaging/native_message_port.h

 // Copyright (c) 2012 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 CHROME_BROWSER_EXTENSIONS_API_MESSAGING_NATIVE_MESSAGE_PORT_H_
 #define CHROME_BROWSER_EXTENSIONS_API_MESSAGING_NATIVE_MESSAGE_PORT_H_
 
-#include "base/threading/thread_checker.h"
 #include "chrome/browser/extensions/api/messaging/message_service.h"
 
 namespace extensions {
 class NativeMessageProcessHost;
 
 // A port that manages communication with a native application.
-// All methods must be called on the UI Thread of the browser process.
 class NativeMessagePort : public MessageService::MessagePort {
  public:
-  NativeMessagePort(base::WeakPtr<MessageService> message_service,
-                    int port_id,
-                    scoped_ptr<NativeMessageHost> native_message_host);
+  // Takes ownership of |native_process|.
+  explicit NativeMessagePort(NativeMessageProcessHost* native_process);
   virtual ~NativeMessagePort();
-
-  // MessageService::MessagePort implementation.
   virtual void DispatchOnMessage(const Message& message,
                                  int target_port_id) override;
+
  private:
-  class Core;
-  void PostMessageFromNativeHost(const std::string& message);
-  void CloseChannel(const std::string& error_message);
-
-  base::ThreadChecker thread_checker_;
-  base::WeakPtr<MessageService> weak_message_service_;
-  scoped_refptr<base::SingleThreadTaskRunner> host_task_runner_;
-  int port_id_;
-  scoped_ptr<Core> core_;
-
-  base::WeakPtrFactory<NativeMessagePort> weak_factory_;
+  NativeMessageProcessHost* native_process_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_MESSAGING_NATIVE_MESSAGE_PORT_H_