Remove base/win/metro.{cc|h} and some associated code

chrome/browser/ui/apps/apps_metro_handler_win.cc

-// Copyright 2013 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 "chrome/browser/ui/apps/apps_metro_handler_win.h"
-
-#include "chrome/app/chrome_command_ids.h"
-#include "chrome/browser/apps/app_window_registry_util.h"
-#include "chrome/browser/ui/simple_message_box.h"
-#include "chrome/grit/chromium_strings.h"
-#include "chrome/grit/generated_resources.h"
-#include "extensions/browser/app_window/app_window.h"
-#include "ui/base/l10n/l10n_util.h"
-
-bool VerifyASHSwitchForApps(gfx::NativeWindow parent_window,
-                            int win_restart_command_id) {
-  DCHECK(win_restart_command_id == IDC_WIN_DESKTOP_RESTART ||
-      win_restart_command_id == IDC_WIN8_METRO_RESTART ||
-      win_restart_command_id == IDC_WIN_CHROMEOS_RESTART);
-  if (!AppWindowRegistryUtil::IsAppWindowVisibleInAnyProfile(
-          extensions::AppWindow::WINDOW_TYPE_DEFAULT)) {
-    return true;
-  }
-
-  int string_id = 0;
-  switch (win_restart_command_id) {
-    case IDC_WIN8_METRO_RESTART:
-      string_id = IDS_WIN8_PROMPT_TO_CLOSE_APPS_FOR_METRO;
-      break;
-    case IDC_WIN_CHROMEOS_RESTART:
-      string_id = IDS_WIN_PROMPT_TO_CLOSE_APPS_FOR_CHROMEOS;
-      break;
-    default:
-      string_id = IDS_WIN_PROMPT_TO_CLOSE_APPS_FOR_DESKTOP;
-      break;
-  }
-  chrome::MessageBoxResult result = chrome::ShowMessageBox(
-      parent_window,
-      l10n_util::GetStringUTF16(IDS_PRODUCT_NAME),
-      l10n_util::GetStringUTF16(string_id),
-      chrome::MESSAGE_BOX_TYPE_OK_CANCEL);
-
-  return result == chrome::MESSAGE_BOX_RESULT_YES;
-}