Remove app/win/win_util.h,cc etc.

ui/base/message_box_win.h

+// 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.
+
+#ifndef UI_BASE_MESSAGE_BOX_WIN_H_
+#define UI_BASE_MESSAGE_BOX_WIN_H_
+#pragma once
+
+#include <windows.h>
+
+#include "base/string16.h"
+
+namespace ui {
+
+// A wrapper around Windows' MessageBox function. Using a Chrome specific
+// MessageBox function allows us to control certain RTL locale flags so that
+// callers don't have to worry about adding these flags when running in a
+// right-to-left locale.
+int MessageBox(HWND hwnd,
+               const string16& text,
+               const string16& caption,
+               UINT flags);
+
+}  // namespace ui
+
+#endif  // UI_BASE_MESSAGE_BOX_WIN_H_