x11: Move X event handling out of the message-pump.

ui/views/controls/menu/menu_message_pump_dispatcher.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 UI_VIEWS_CONTROLS_MENU_MENU_MESSAGE_PUMP_DISPATCHER_H_
-#define UI_VIEWS_CONTROLS_MENU_MENU_MESSAGE_PUMP_DISPATCHER_H_
-
-#include "base/macros.h"
-#include "base/message_loop/message_pump_dispatcher.h"
-
-namespace views {
-
-class MenuController;
-
-namespace internal {
-
-// A message-pump dispatcher object used to dispatch events from the nested
-// message-loop initiated by the MenuController.
-class MenuMessagePumpDispatcher : public base::MessagePumpDispatcher {
- public:
-  explicit MenuMessagePumpDispatcher(MenuController* menu_controller);
-  virtual ~MenuMessagePumpDispatcher();
-
- private:
-  // base::MessagePumpDispatcher:
-  virtual uint32_t Dispatch(const base::NativeEvent& event) OVERRIDE;
-
-  MenuController* menu_controller_;
-
-  DISALLOW_COPY_AND_ASSIGN(MenuMessagePumpDispatcher);
-};
-
-}  // namespace internal
-}  // namespace views
-
-#endif  // UI_VIEWS_CONTROLS_MENU_MENU_MESSAGE_PUMP_DISPATCHER_H_