Move handling of dialog preferences to Preferences class

chrome/browser/resources/options2/language_options.js

Index: chrome/browser/resources/options2/language_options.js
diff --git a/chrome/browser/resources/options2/language_options.js b/chrome/browser/resources/options2/language_options.js
index 4beb0f59e451c897df97c90479771b398109d023..fdc26421ee50f6e8a01577afa662891c4d983eb3 100644
--- a/chrome/browser/resources/options2/language_options.js
+++ b/chrome/browser/resources/options2/language_options.js
@@ -629,7 +629,8 @@ cr.define('options', function() {
       var languageCode = e.target.languageCode;
       // Save the preference.
       Preferences.setStringPref(this.spellCheckDictionaryPref,
-                                languageCode);
+                                languageCode,
+                                true);
       chrome.send('spellCheckLanguageChange', [languageCode]);
     },
 
@@ -690,7 +691,8 @@ cr.define('options', function() {
      */
     savePreloadEnginesPref_: function() {
       Preferences.setStringPref(this.preloadEnginesPref,
-                                this.preloadEngines_.join(','));
+                                this.preloadEngines_.join(','),
+                                true);
     },
 
     /**