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

chrome/browser/ui/apps/apps_metro_handler_win.h

Index: chrome/browser/ui/apps/apps_metro_handler_win.h
diff --git a/chrome/browser/ui/apps/apps_metro_handler_win.h b/chrome/browser/ui/apps/apps_metro_handler_win.h
deleted file mode 100644
index 19a060034a10f2cde95419475cee61093518eb2b..0000000000000000000000000000000000000000
--- a/chrome/browser/ui/apps/apps_metro_handler_win.h
+++ /dev/null
@@ -1,17 +0,0 @@
-// 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.
-
-#ifndef CHROME_BROWSER_UI_APPS_APPS_METRO_HANDLER_WIN_H_
-#define CHROME_BROWSER_UI_APPS_APPS_METRO_HANDLER_WIN_H_
-
-#include "ui/gfx/native_widget_types.h"
-
-// Check if there are apps running and if not, return true. Otherwise, Show a
-// modal dialog on |parent| asking whether the user is OK with their packaged
-// apps closing, in order to relaunch to or from Windows ASH mode. Returns true
-// if the user clicks OK.
-bool VerifyASHSwitchForApps(gfx::NativeWindow parent,
-                            int win_restart_command_id);
-
-#endif  // CHROME_BROWSER_UI_APPS_APPS_METRO_HANDLER_WIN_H_