Move handling of dialog preferences to Preferences class

chrome/browser/resources/options2/language_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', function() {
   /** @const */ var ArrayDataModel = cr.ui.ArrayDataModel;
   /** @const */ var DeletableItem = options.DeletableItem;
   /** @const */ var DeletableItemList = options.DeletableItemList;
   /** @const */ var List = cr.ui.List;
   /** @const */ var ListItem = cr.ui.ListItem;
@@ skipping 385 matching lines @@
       }
     },
 
     /**
      * Saves the preference.
      */
     savePreference_: function() {
       // Encode the language codes into a CSV string.
       if (cr.isChromeOS)
         Preferences.setStringPref(this.preferredLanguagesPref,
-                                  this.dataModel.slice().join(','));
+                                  this.dataModel.slice().join(','),
+                                  true);
       // Save the same language list as accept languages preference as
       // well, but we need to expand the language list, to make it more
       // acceptable. For instance, some web sites don't understand 'en-US'
       // but 'en'. See crosbug.com/9884.
       var acceptLanguages = this.expandLanguageCodes(this.dataModel.slice());
       Preferences.setStringPref(this.acceptLanguagesPref,
-                                acceptLanguages.join(','));
+                                acceptLanguages.join(','),
+                                true);
       cr.dispatchSimpleEvent(this, 'save');
     },
 
     /**
      * Expands language codes to make these more suitable for Accept-Language.
      * Example: ['en-US', 'ja', 'en-CA'] => ['en-US', 'en', 'ja', 'en-CA'].
      * 'en' won't appear twice as this function eliminates duplicates.
      * @param {Array} languageCodes List of language codes.
      * @private
      */
@@ skipping 35 matching lines @@
       }
       return filteredLanguageCodes;
     },
   };
 
   return {
     LanguageList: LanguageList,
     LanguageListItem: LanguageListItem
   };
 });