Add controlled setting indicator for default search engine configuration

chrome/browser/resources/options/browser_options.js

 // Copyright (c) 2012 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;
   var ArrayDataModel = cr.ui.ArrayDataModel;
   var RepeatingButton = cr.ui.RepeatingButton;
 
   //
@@ skipping 801 matching lines @@
      * @param {Array} engines List of available search engines.
      * @param {number} defaultValue The value of the current default engine.
      * @param {boolean} defaultManaged Whether the default search provider is
      *     managed. If true, the default search provider can't be changed.
      * @private
      */
     updateSearchEngines_: function(engines, defaultValue, defaultManaged) {
       this.clearSearchEngines_();
       engineSelect = $('default-search-engine');
       engineSelect.disabled = defaultManaged;
+      if (defaultManaged && defaultValue == -1)
+        return;
       engineCount = engines.length;
       var defaultIndex = -1;
       for (var i = 0; i < engineCount; i++) {
         var engine = engines[i];
         var option = new Option(engine.name, engine.index);
         if (defaultValue == option.value)
           defaultIndex = i;
         engineSelect.appendChild(option);
       }
       if (defaultIndex >= 0)
@@ skipping 510 matching lines @@
     BrowserOptions.getLoggedInUsername = function() {
       return BrowserOptions.getInstance().username_;
     };
   }
 
   // Export
   return {
     BrowserOptions: BrowserOptions
   };
 });