ui/base: Move message_box_win.{h,cc} to ui/base/win.

ui/base/message_box_win.cc

-// Copyright (c) 2011 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 "ui/base/message_box_win.h"
-
-#include <windows.h>
-
-#include "base/base_switches.h"
-#include "base/command_line.h"
-#include "base/i18n/rtl.h"
-#include "base/string16.h"
-
-namespace ui {
-
-// In addition to passing the RTL flags to ::MessageBox if we are running in an
-// RTL locale, we need to make sure that LTR strings are rendered correctly by
-// adding the appropriate Unicode directionality marks.
-int MessageBox(HWND hwnd,
-               const string16& text,
-               const string16& caption,
-               UINT flags) {
-  if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kNoMessageBox))
-    return IDOK;
-
-  UINT actual_flags = flags;
-  if (base::i18n::IsRTL())
-    actual_flags |= MB_RIGHT | MB_RTLREADING;
-
-  string16 localized_text = text;
-  base::i18n::AdjustStringForLocaleDirection(&localized_text);
-  const wchar_t* text_ptr = localized_text.c_str();
-
-  string16 localized_caption = caption;
-  base::i18n::AdjustStringForLocaleDirection(&localized_caption);
-  const wchar_t* caption_ptr = localized_caption.c_str();
-
-  return ::MessageBox(hwnd, text_ptr, caption_ptr, actual_flags);
-}
-
-}  // namespace ui