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

Index: chrome/browser/ui/views/simple_message_box_win.cc
===================================================================
--- chrome/browser/ui/views/simple_message_box_win.cc	(revision 156397)
+++ chrome/browser/ui/views/simple_message_box_win.cc	(working copy)
@@ -5,6 +5,7 @@
 #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 {
@@ -15,6 +16,9 @@
                                 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) ?