[Policy Experimental] Add "recommended" policies for URL exceptions.

chrome/browser/resources/options/content_settings_exceptions_area.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.contentSettings', function() {
   /** @const */ var ControlledSettingIndicator =
                     options.ControlledSettingIndicator;
   /** @const */ var InlineEditableItemList = options.InlineEditableItemList;
   /** @const */ var InlineEditableItem = options.InlineEditableItem;
   /** @const */ var ArrayDataModel = cr.ui.ArrayDataModel;
@@ skipping 185 matching lines @@
       var controlledBy =
           this.dataItem.source && this.dataItem.source != 'preference' ?
               this.dataItem.source : null;
 
       if (controlledBy) {
         this.setAttribute('controlled-by', controlledBy);
         this.deletable = false;
         this.editable = false;
       }
 
-      if (controlledBy == 'policy' || controlledBy == 'extension') {
+      if (controlledBy == 'policy' || controlledBy == 'extension' ||
+          controlledBy == 'recommended') {
         this.querySelector('.row-delete-button').hidden = true;
         var indicator = new ControlledSettingIndicator();
         indicator.setAttribute('content-exception', this.contentType);
         // Create a synthetic pref change event decorated as
         // CoreOptionsHandler::CreateValueForPref() does.
         var event = new Event(this.contentType);
         event.value = { controlledBy: controlledBy };
         indicator.handlePrefChange(event);
         this.appendChild(indicator);
       }
@@ skipping 479 matching lines @@
     }
   };
 
   return {
     ExceptionsListItem: ExceptionsListItem,
     ExceptionsAddRowListItem: ExceptionsAddRowListItem,
     ExceptionsList: ExceptionsList,
     ContentSettingsExceptionsArea: ContentSettingsExceptionsArea,
   };
 });