title: Webkit notifications requestPermission function doesn't work
body: <p>I am trying to implement support for WebKit's native desktop notifications on my site. When I try to ask for user's permission to use the notifications, absolutely nothing happens. For example, the following HTML does not prompt Chrome to ask me for permission:</p>
  
  <pre><code>&lt;html lang="en"&gt;
  &lt;head&gt;&lt;/head&gt;
  
  &lt;body&gt;
      &lt;h1&gt;Testing&lt;/h1&gt;
      &lt;script&gt;
          window.webkitNotifications.requestPermission();
      &lt;/script&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>I know that there is no problem with my version of Chrome because other sites (e.g. <a href="http://www.html5rocks.com/tutorials/notifications/quick/" rel="noreferrer">http://www.html5rocks.com/tutorials/notifications/quick/</a>) work perfectly fine: I can see both the prompt and the subsequent notifications.</p>