Update dialog parent handling logic.

chrome/browser/gtk/gtk_util.h

 // Copyright (c) 2010 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 CHROME_BROWSER_GTK_GTK_UTIL_H_
 #define CHROME_BROWSER_GTK_GTK_UTIL_H_
 
 #include <gtk/gtk.h>
 #include <string>
 #include <vector>
@@ skipping 282 matching lines @@
                                  int height_id,
                                  bool resizeable);
 void ShowModalDialogWithMinLocalizedWidth(GtkWidget* dialog,
                                           int width_id);
 
 // Wrapper to present a window. On Linux, it just calls gtk_window_present or
 // gtk_window_present_with_time for non-zero timestamp. For ChromeOS, it first
 // finds the host window of the dialog contents and then present it.
 void PresentWindow(GtkWidget* window, int timestamp);
 
+// Get real window for given dialog. On ChromeOS, this gives the native dialog
+// host window. On Linux, it merely returns the passed in dialog.
+GtkWindow* GetDialogWindow(GtkWidget* dialog);
+
 }  // namespace gtk_util
 
 #endif  // CHROME_BROWSER_GTK_GTK_UTIL_H_