Show a different banner in chrome://settings for extension-controlled settings.

chrome/browser/resources/options/content_settings.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;
 
   //////////////////////////////////////////////////////////////////////////////
   // ContentSettings class:
@@ skipping 64 matching lines @@
    * @param {Object} dict A mapping from radio groups to the checked value for
    *     that group.
    */
   ContentSettings.setContentFilterSettingsValue = function(dict) {
     for (var group in dict) {
       document.querySelector('input[type=radio][name=' + group + '][value=' +
                              dict[group]['value'] + ']').checked = true;
       var radios = document.querySelectorAll('input[type=radio][name=' +
                                              group + ']');
       for (var i = 0, len = radios.length; i < len; i++) {
-        radios[i].disabled = dict[group]['managed'];
-        radios[i].managed = dict[group]['managed'];
+        var managed = dict[group]['managed'];
+        radios[i].disabled = managed;
+        radios[i].controlledBy = managed ? 'policy': null;
       }
     }
     OptionsPage.updateManagedBannerVisibility();
   };
 
   /**
    * Initializes an exceptions list.
    * @param {string} type The content type that we are setting exceptions for.
    * @param {Array} list An array of pairs, where the first element of each pair
    *     is the filter string, and the second is the setting (allow/block).
@@ skipping 34 matching lines @@
                                'list[mode=' + mode + ']');
     exceptionsList.patternValidityCheckComplete(pattern, valid);
   };
 
   // Export
   return {
     ContentSettings: ContentSettings
   };
 
 });