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

chrome/browser/extensions/api/messaging/extension_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_EXTENSION_MESSAGE_PORT_H_
-#define CHROME_BROWSER_EXTENSIONS_API_MESSAGING_EXTENSION_MESSAGE_PORT_H_
-
-#include "chrome/browser/extensions/api/messaging/message_service.h"
-
-namespace content {
-class RenderProcessHost;
-}  // namespace content
-
-namespace extensions {
-
-// A port that manages communication with an extension.
-class ExtensionMessagePort : public MessageService::MessagePort {
- public:
-  ExtensionMessagePort(content::RenderProcessHost* process,
-                       int routing_id,
-                       const std::string& extension_id);
-  virtual void DispatchOnConnect(
-      int dest_port_id,
-      const std::string& channel_name,
-      const std::string& tab_json,
-      const std::string& source_extension_id,
-      const std::string& target_extension_id) OVERRIDE;
-  virtual void DispatchOnDisconnect(int source_port_id,
-                                    bool connection_error) OVERRIDE;
-  virtual void DispatchOnMessage(const std::string& message,
-                                 int target_port_id) OVERRIDE;
-  virtual void IncrementLazyKeepaliveCount() OVERRIDE;
-  virtual void DecrementLazyKeepaliveCount() OVERRIDE;
-  virtual content::RenderProcessHost* GetRenderProcessHost() OVERRIDE;
-
- private:
-  content::RenderProcessHost* process_;
-  int routing_id_;
-  std::string extension_id_;
-  void* background_host_ptr_;  // used in IncrementLazyKeepaliveCount
-};
-
-}  // namespace extensions
-
-#endif  // CHROME_BROWSER_EXTENSIONS_API_MESSAGING_EXTENSION_MESSAGE_PORT_H_