Reduce usage of webkit prefixes in extension examples

chrome/common/extensions/docs/examples/extensions/news/javascript/options.js

 /**
  * Copyright (c) 2010 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.
  */
 
 /**
  * @fileoverview Includes the country selection, topics selection and
  * selection of no. of news stories to be shown. Include default settings also.
  * @author navneetg@google.com (Navneet Goel).
@@ skipping 69 matching lines @@
   }
 }
 
 /**
  * Displays various messages to user based on user input.
  * @param {String} id Id of status element.
  * @param {Number} timeOut Timeout value of message shown.
  * @param {String} message Message to be shown.
  */
 function showUserMessages(id, timeOut, message) {
-  $(id).style.setProperty('-webkit-transition',
+  $(id).style.setProperty('transition',
       'opacity 0s ease-in');
   $(id).style.opacity = 1;
   $(id).innerText = chrome.i18n.getMessage(message);
   window.setTimeout(function() {
     $(id).style.setProperty(
-        '-webkit-transition', 'opacity' + timeOut + 's ease-in');
+        'transition', 'opacity' + timeOut + 's ease-in');
     $(id).style.opacity = 0;
     }, 1E3
   );
 }
 
 /**
  * Sets options page CSS according to the browser language(if found), else sets
  * to default locale.
  */
 function setOptionPageCSS() {
@@ skipping 279 matching lines @@
       }
     }
 
     checkCount--;
     $('submit_button').disabled = false;
   } else {
     showUserMessages('save_status', 2.5, 'noTopic');
   }
   $('newKeyword').readOnly = false;
 }