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

extensions/browser/api/messaging/native_message_host.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 EXTENSIONS_BROWSER_API_MESSAGING_NATIVE_MESSAGE_HOST_H_
-#define EXTENSIONS_BROWSER_API_MESSAGING_NATIVE_MESSAGE_HOST_H_
-
-#include <string>
-
-#include "base/memory/scoped_ptr.h"
-#include "base/single_thread_task_runner.h"
-#include "ui/gfx/native_widget_types.h"
-
-namespace extensions {
-
-// An interface for receiving messages from MessageService (Chrome) using the
-// Native Messaging API.  A NativeMessageHost object hosts a native component,
-// which can run in the browser-process or in a separate process (See
-// NativeMessageProcessHost).
-class NativeMessageHost {
- public:
-  static const char kFailedToStartError[];
-  static const char kInvalidNameError[];
-  static const char kNativeHostExited[];
-  static const char kNotFoundError[];
-  static const char kForbiddenError[];
-  static const char kHostInputOuputError[];
-
-  // Callback interface for receiving messages from the native host.
-  class Client {
-   public:
-    virtual ~Client() {}
-
-    // Called on the UI thread.
-    virtual void PostMessageFromNativeHost(const std::string& message) = 0;
-    virtual void CloseChannel(const std::string& error_message) = 0;
-  };
-
-  // Creates the NativeMessageHost based on the |native_host_name|.
-  static scoped_ptr<NativeMessageHost> Create(
-      gfx::NativeView native_view,
-      const std::string& source_extension_id,
-      const std::string& native_host_name,
-      bool allow_user_level,
-      std::string* error);
-
-  virtual ~NativeMessageHost() {}
-
-  // Called when a message is received from MessageService (Chrome).
-  virtual void OnMessage(const std::string& message) = 0;
-
-  // Sets the client to start receiving messages from the native host.
-  virtual void Start(Client* client) = 0;
-
-  // Returns the task runner that the host runs on. The Client should only
-  // invoke OnMessage() on this task runner.
-  virtual scoped_refptr<base::SingleThreadTaskRunner> task_runner() const = 0;
-};
-
-}  // namespace extensions
-
-#endif  // EXTENSIONS_BROWSER_API_MESSAGING_NATIVE_MESSAGE_HOST_H_