Revert 156678 - Native messaging now uses the MessageService back-end.

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 "chrome/browser/extensions/api/messaging/message_service.h"
-
-namespace extensions {
-class NativeMessageProcessHost;
-
-// A port that manages communication with a native application.
-class NativeMessagePort : public MessageService::MessagePort {
- public:
-  // Takes ownership of |native_process|.
-  explicit NativeMessagePort(NativeMessageProcessHost* native_process);
-  virtual ~NativeMessagePort();
-  virtual void DispatchOnMessage(const std::string& message,
-                                 int target_port_id) OVERRIDE;
-
- private:
-  NativeMessageProcessHost* native_process_;
-};
-
-}  // namespace extensions
-
-#endif  // CHROME_BROWSER_EXTENSIONS_API_MESSAGING_NATIVE_MESSAGE_PORT_H_