Fix links to issue tracker in extensions docs

chrome/common/extensions/docs/templates/articles/desktop_notifications.html

 <h1>Rich Notifications</h1>
 
 <p class="warning"><b>Warning:</b>
 <code>webKitNotifications.createHTMLNotification()</code> in the
 <a href="http://www.chromium.org/developers/design-documents/desktop-notifications/api-specification">web notifications API</a> has been deprecated.
 The new <a href="http://www.w3.org/TR/notifications/">web notifications API</a> only allows text.
 <a href="notifications">Chrome notifications API</a>
 will be promoted to stable soon and
 web notifications will be updated
 to use the new rich notifications format.
@@ skipping 30 matching lines @@
 <p>First, declare the <code>notifications</code> permission in your manifest:</p>
 <pre data-filename="manifest.json">
 {
   "name": "My extension",
   "manifest_version": 2,
   ...
 <b>  "permissions": [
     "notifications"
   ]</b>,
   ...
-  // <strong>Note:</strong> Because of <a href="http://code.google.com/p/chromium/issues/detail?id=134315">bug 134315</a>, you must declare any images you
+  // <strong>Note:</strong> Because of <a href="http://bugs.chromium.org/p/chromium/issues/detail?id=134315">bug 134315</a>, you must declare any images you
   // want to use with createNotification() as a web accessible resource.
 <b>  "web_accessible_resources": [
     "48.png"
   ]</b>,
 }
 </pre>
 
 <p>Then, use <code>webkitNotifications</code> object to create notifications:</p>
 
 <pre>
@@ skipping 52 matching lines @@
 and for help in viewing the source code,
 see <a href="samples">Samples</a>.
 </p>
 
 <p>
 Also see html5rocks.com's
 <a href="http://www.html5rocks.com/tutorials/notifications/quick/">notifications tutorial</a>.
 Ignore the permission-related code;
 it's unnecessary if you declare the "notifications" permission.
 </p>