Update the Stylizr example to work with the manifest changes the Storage API.

chrome/common/extensions/docs/examples/api/storage/stylizr/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.
 
 // Store settings in the synchronized repository.
 var storage = chrome.storage.sync;
 
 // Get at the DOM controls used in the sample.
 var resetButton = document.querySelector('button.reset');
 var submitButton = document.querySelector('button.submit');
@@ skipping 15 matching lines @@
   }
   // Save it using the Chrome extension storage API.
   storage.set({'css': cssCode}, function() {
     // Notify that we saved.
     message('Settings saved');
   });
 }
 
 function loadChanges() {
   storage.get('css', function(items) {
+    // To avoid checking items.css we could specify storage.get({css: ''}) to
+    // return a default value of '' if there is no css value yet.
     if (items.css) {
       textarea.value = items.css;
       message('Loaded saved CSS.');
     }
   });
 }
 
 function reset() {
-  // Remove the saved value from storage
+  // Remove the saved value from storage. storage.clear would achieve the same
+  // thing.
   storage.remove('css', function(items) {
     message('Reset stored CSS');
   });
   // Refresh the text area.
   textarea.value = '';
 }
 
 function message(msg) {
   var message = document.querySelector('.message');
   message.innerText = msg;
   setTimeout(function() {
     message.innerText = '';
   }, 3000);
 }