mash: Convert system tray logout button to wm common types

ash/system/chromeos/session/last_window_closed_logout_reminder.cc

-// 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.
-
-#include "ash/system/chromeos/session/last_window_closed_logout_reminder.h"
-
-#include "ash/common/login_status.h"
-#include "ash/common/system/tray/system_tray_delegate.h"
-#include "ash/common/system/tray/system_tray_notifier.h"
-#include "ash/common/wm_shell.h"
-#include "ash/shell.h"
-#include "ash/system/chromeos/session/logout_confirmation_controller.h"
-#include "base/time/time.h"
-
-namespace ash {
-namespace {
-const int kLogoutConfirmationDelayInSeconds = 20;
-}
-
-LastWindowClosedLogoutReminder::LastWindowClosedLogoutReminder() {
-  WmShell::Get()->system_tray_notifier()->AddLastWindowClosedObserver(this);
-}
-
-LastWindowClosedLogoutReminder::~LastWindowClosedLogoutReminder() {
-  WmShell::Get()->system_tray_notifier()->RemoveLastWindowClosedObserver(this);
-}
-
-void LastWindowClosedLogoutReminder::OnLastWindowClosed() {
-  if (WmShell::Get()->system_tray_delegate()->GetUserLoginStatus() !=
-      LoginStatus::PUBLIC) {
-    return;
-  }
-
-  // Ask the user to confirm logout if a public session is in progress and the
-  // screen is not locked.
-  Shell::GetInstance()->logout_confirmation_controller()->ConfirmLogout(
-      base::TimeTicks::Now() +
-      base::TimeDelta::FromSeconds(kLogoutConfirmationDelayInSeconds));
-}
-
-}  // namespace ash