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

chrome/browser/resources/options/personal_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.
 
 cr.define('options', function() {
 
   var OptionsPage = options.OptionsPage;
 
   // State variables.
   var syncEnabled = false;
@@ skipping 62 matching lines @@
             chrome.send('themesSetGTK');
           };
         }
       } else {
         chrome.send('loadAccountPicture');
       }
 
       if (cr.commandLine.options['--bwsi']) {
         // Disable the screen lock checkbox for the guest mode.
         $('enable-screen-lock').disabled = true;
+      }
 
-        // Disable passwords management settings for the guest mode.
+      if (PersonalOptions.disablePasswordManagement()) {
         $('passwords-offersave').disabled = true;
         $('passwords-neversave').disabled = true;
         $('passwords-offersave').value = false;
         $('passwords-neversave').value = true;
         $('manage-passwords').disabled = true;
       }
     },
 
     showStopSyncingOverlay_: function(event) {
       AlertOverlay.show(localStrings.getString('stop_syncing_title'),
@@ skipping 82 matching lines @@
         if (type.match(/Registered$/) && !dict[type]) {
           node = $(type.replace(/([a-z]+)Registered$/i, '$1').toLowerCase()
                    + '-check');
           if (node)
             node.parentNode.style.display = 'none';
         }
       }
     },
   };
 
+  /**
+   * Returns whether the user should be able to manage (view and edit) their
+   * stored passwords. Password management is disabled in guest mode.
+   * @return {boolean} True if password management should be disabled.
+   */
+  PersonalOptions.disablePasswordManagement = function() {
+    return cr.commandLine.options['--bwsi'];
+  };
+
   // Forward public APIs to private implementations.
   [
     'setSyncEnabled',
     'setSyncSetupCompleted',
     'setAccountPicture',
     'setSyncStatus',
     'setSyncStatusErrorVisible',
     'setSyncActionLinkEnabled',
     'setSyncActionLinkLabel',
     'setStartStopButtonVisible',
     'setStartStopButtonEnabled',
     'setStartStopButtonLabel',
     'setGtkThemeButtonEnabled',
     'setThemesResetButtonEnabled',
     'hideSyncSection',
     'setRegisteredDataTypes',
   ].forEach(function(name) {
     PersonalOptions[name] = function(value) {
       PersonalOptions.getInstance()[name + '_'](value);
     };
   });
 
   // Export
   return {
     PersonalOptions: PersonalOptions
   };
 
 });