Move handling of dialog preferences to Preferences class

chrome/browser/resources/options/chromeos/proxy_rules_list.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.proxyexceptions', function() {
   /** @const */ var List = cr.ui.List;
   /** @const */ var ListItem = cr.ui.ListItem;
   /** @const */ var ArrayDataModel = cr.ui.ArrayDataModel;
 
   /**
@@ skipping 75 matching lines @@
      * @param {Array} exceptions An array of exception object.
      */
     load_: function(exceptions) {
       this.dataModel = new ArrayDataModel(exceptions);
     },
 
     /**
      * Updates backend.
      */
     updateBackend_: function() {
-      Preferences.setListPref(this.pref, this.dataModel.slice());
+      Preferences.setListPref(this.pref, this.dataModel.slice(), true);
     }
   };
 
   /**
    * Creates a new exception list item.
    * @param {Object} exception The exception account this represents.
    * @constructor
    * @extends {cr.ui.ListItem}
    */
   function ProxyExceptionsItem(exception) {
@@ skipping 24 matching lines @@
       labelException.className = '';
       labelException.textContent = this.exception;
       this.appendChild(labelException);
     }
   };
 
   return {
     ProxyExceptions: ProxyExceptions
   };
 });