chrome://settings - Provide method for pages to prevent themselves being shown.

chrome/browser/resources/options/options.js

 // 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.
 
 var AddLanguageOverlay = options.AddLanguageOverlay;
 var AddStartupPageOverlay = options.AddStartupPageOverlay;
 var AdvancedOptions = options.AdvancedOptions;
 var AlertOverlay = options.AlertOverlay;
 var AutoFillEditAddressOverlay = options.AutoFillEditAddressOverlay;
 var AutoFillEditCreditCardOverlay = options.AutoFillEditCreditCardOverlay;
@@ skipping 143 matching lines @@
         'languageCustomizeModifierKeysOverlay')
     OptionsPage.registerOverlay(languageModifierKeysOverlay,
                                 SystemOptions.getInstance(),
                                 [$('modifier-keys-button')]);
   }
 
   Preferences.getInstance().initialize();
   OptionsPage.initialize();
 
   var path = document.location.pathname;
-  // TODO(estade): remove this explicit hash handling. Pages should check for
-  // location.hash in didShowPage.
-  var hash = document.location.hash;
 
   if (path.length > 1) {
     var pageName = path.slice(1);
     // Show page, but don't update history (there's already an entry for it).
     OptionsPage.showPageByName(pageName, false);
-    if (hash.length > 1)
-      OptionsPage.handleHashForPage(pageName, hash.slice(1));
   } else {
     OptionsPage.showDefaultPage();
   }
 
   var subpagesNavTabs = document.querySelectorAll('.subpages-nav-tabs');
   for(var i = 0; i < subpagesNavTabs.length; i++) {
     subpagesNavTabs[i].onclick = function(event) {
       OptionsPage.showTab(event.srcElement);
     }
   }
@@ skipping 16 matching lines @@
   $('settings-title').onclick = function() {
     OptionsPage.navigateToPage(BrowserOptions.getInstance().name);
   };
 }
 
 document.addEventListener('DOMContentLoaded', load);
 
 window.onpopstate = function(e) {
   options.OptionsPage.setState(e.state);
 };