mash: Convert system tray logout button to wm common types

ash/system/chromeos/session/logout_confirmation_dialog.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 ASH_SYSTEM_CHROMEOS_SESSION_LOGOUT_CONFIRMATION_DIALOG_H_
-#define ASH_SYSTEM_CHROMEOS_SESSION_LOGOUT_CONFIRMATION_DIALOG_H_
-
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "base/time/time.h"
-#include "base/timer/timer.h"
-#include "ui/views/window/dialog_delegate.h"
-
-namespace views {
-class Label;
-}
-
-namespace ash {
-
-class LogoutConfirmationController;
-
-// A dialog that asks the user to confirm or deny logout. The dialog shows a
-// countdown and informs the user that a logout will happen automatically if no
-// choice is made before the countdown has expired.
-class LogoutConfirmationDialog : public views::DialogDelegateView {
- public:
-  LogoutConfirmationDialog(LogoutConfirmationController* controller,
-                           base::TimeTicks logout_time);
-  ~LogoutConfirmationDialog() override;
-
-  void Update(base::TimeTicks logout_time);
-
-  // Called when |controller_| is no longer valid.
-  void ControllerGone();
-
-  // views::DialogDelegateView:
-  bool Accept() override;
-  ui::ModalType GetModalType() const override;
-  base::string16 GetWindowTitle() const override;
-  base::string16 GetDialogButtonLabel(ui::DialogButton button) const override;
-  void WindowClosing() override;
-
- private:
-  void UpdateLabel();
-
-  LogoutConfirmationController* controller_;
-  base::TimeTicks logout_time_;
-
-  views::Label* label_;
-
-  base::RepeatingTimer update_timer_;
-
-  DISALLOW_COPY_AND_ASSIGN(LogoutConfirmationDialog);
-};
-
-}  // namespace ash
-
-#endif  // ASH_SYSTEM_CHROMEOS_SESSION_LOGOUT_CONFIRMATION_DIALOG_H_