Prevent public session users from changing locale via settings

chrome/browser/resources/options/language_options.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.
 
 // TODO(kochi): Generalize the notification as a component and put it
 // in js/cr/ui/notification.js .
 
 cr.define('options', function() {
   /** @const */ var OptionsPage = options.OptionsPage;
   /** @const */ var LanguageList = options.LanguageList;
@@ skipping 235 matching lines @@
       }
 
       if (cr.isChromeOS) {
         $('language-options-ui-restart-button').onclick = function() {
           chrome.send('uiLanguageRestart');
         };
       }
 
       $('language-confirm').onclick =
           OptionsPage.closeOverlay.bind(OptionsPage);
+
+      // Public session users cannot change the locale.
+      if (cr.isChromeOS && UIAccountTweaks.loggedInAsPublicAccount())
+        $('language-options-ui-language-section').hidden = true;
     },
 
     /**
      * Initializes the input method list.
      */
     initializeInputMethodList_: function() {
       var inputMethodList = $('language-options-input-method-list');
       var inputMethodPrototype = $('language-options-input-method-template');
 
       // Add all input methods, but make all of them invisible here. We'll
@@ skipping 1090 matching lines @@
 
   LanguageOptions.onComponentManagerInitialized = function(componentImes) {
     LanguageOptions.getInstance().appendComponentExtensionIme_(componentImes);
   };
 
   // Export
   return {
     LanguageOptions: LanguageOptions
   };
 });