Move handling of dialog preferences to Preferences class

chrome/browser/resources/options/spelling_confirm_overlay.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 SettingsDialog = options.SettingsDialog;
 
   /*
    * SpellingConfirmOverlay class
    * Dialog to confirm that the user really wants to use the Spelling service
@@ skipping 14 matching lines @@
     __proto__: SettingsDialog.prototype,
 
     /** @inheritDoc */
     initializePage: function() {
       SettingsDialog.prototype.initializePage.call(this);
     },
 
     /** @inheritDoc */
     handleConfirm: function() {
       SettingsDialog.prototype.handleConfirm.call(this);
-      Preferences.setBooleanPref('spellcheck.use_spelling_service', true);
-      Preferences.setBooleanPref('spellcheck.confirm_dialog_shown', true);
+      Preferences.setBooleanPref('spellcheck.use_spelling_service',
+                                 true, true);
+      Preferences.setBooleanPref('spellcheck.confirm_dialog_shown',
+                                 true, true);
     },
 
     /** @inheritDoc */
     handleCancel: function() {
       SettingsDialog.prototype.handleCancel.call(this);
       $('spelling-enabled-control').checked = false;
     },
   };
 
   // Export
   return {
     SpellingConfirmOverlay: SpellingConfirmOverlay
   };
 });