Ensure that message boxes displayed by Chrome in Windows 8 metro mode pass in the metro core window

chrome/browser/ui/views/simple_message_box_win.cc

 // Copyright (c) 2012 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/simple_message_box.h"
 
 #include "chrome/common/startup_metric_utils.h"
+#include "ui/base/win/hwnd_util.h"
 #include "ui/base/win/message_box_win.h"
 
 namespace chrome {
 
 MessageBoxResult ShowMessageBox(gfx::NativeWindow parent,
                                 const string16& title,
                                 const string16& message,
                                 MessageBoxType type) {
   startup_metric_utils::SetNonBrowserUIDisplayed();
 
+  if (!parent)
+    parent = ui::GetWindowToParentTo(true);
+
   UINT flags = MB_SETFOREGROUND;
   flags |= ((type == MESSAGE_BOX_TYPE_QUESTION) ? MB_YESNO : MB_OK);
   flags |= ((type == MESSAGE_BOX_TYPE_INFORMATION) ?
       MB_ICONINFORMATION : MB_ICONWARNING);
   return (ui::MessageBox(parent, message, title, flags) == IDNO) ?
       MESSAGE_BOX_RESULT_NO : MESSAGE_BOX_RESULT_YES;
 }
 
 }  // namespace chrome