Remove parent window (dangling in background) for chrome://settings when invoked at OOBE screen.

chrome/browser/resources/options/options_page.js

 // 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.
 
 cr.define('options', function() {
   /////////////////////////////////////////////////////////////////////////////
   // OptionsPage class:
 
   /**
    * Base class for options page.
@@ skipping 52 matching lines @@
     // Update the visibility attribute for main pages.
     for (var name in this.registeredPages) {
       var page = this.registeredPages[name];
       page.visible = name == pageName;
     }
 
     // Update the visibility attribute for sub-pages.
     for (var name in this.registeredSubPages) {
       var pageInfo = this.registeredSubPages[name];
       var match = name == pageName;
-      if (match)
+      if (match && document.documentElement.getAttribute('hide-menu') != 'true')
         pageInfo.parentPage.visible = true;
       pageInfo.page.visible = match;
     }
 
     // Notify main pages if they were shown.
     for (var name in this.registeredPages) {
       var page = this.registeredPages[name];
       if (name == pageName && page.didShowPage)
         page.didShowPage();
     }
@@ skipping 265 matching lines @@
       OptionsPage.showOverlay(hash);
     },
   };
 
   // Export
   return {
     OptionsPage: OptionsPage
   };
 
 });