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

chrome/browser/ui/views/simple_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 "chrome/browser/simple_message_box.h"
 
-#include "ui/base/message_box_win.h"
+#include "ui/base/win/message_box_win.h"
 
 namespace browser {
 
 void ShowErrorBox(gfx::NativeWindow parent,
                   const string16& title,
                   const string16& message) {
   UINT flags = MB_OK | MB_ICONWARNING | MB_SETFOREGROUND | MB_TOPMOST;
   ui::MessageBox(parent, message, title, flags);
 }
 
 bool ShowYesNoBox(gfx::NativeWindow parent,
                   const string16& title,
                   const string16& message) {
   UINT flags = MB_YESNO | MB_ICONWARNING | MB_SETFOREGROUND;
   int result = ui::MessageBox(parent, message, title, flags);
   return result == IDYES;
 }
 
 }  // namespace browser