Remove chrome/ code to handle App Notifications

chrome/common/extensions/docs/templates/intros/permissions.html

 <p id="classSummary">
   Use the <code>chrome.permissions</code> module
   to implement optional permissions.
   As of Chrome 16, you can request optional permissions during your
   extension's regular application flow rather than at install time,
   so users understand why the permissions are needed
   and use only those that are necessary.
 </p>
 
 <p>
@@ skipping 55 matching lines @@
   ...
   <b>"optional_permissions": [ "tabs", "http://www.google.com/" ],</b>
   ...
 }</pre>
 </p>
 
 <p>
 You can specify any of the following as optional permissions:
 <ul>
   <li><i>host permissions</i></li>
-  <li>appNotifications</li>
   <li>background</li>
   <li>bookmarks</li>
   <li>clipboardRead</li>
   <li>clipboardWrite</li>
   <li>contentSettings</li>
   <li>contextMenus</li>
   <li>cookies</li>
   <li>debugger</li>
   <li>history</li>
   <li>idle</li>
@@ skipping 77 matching lines @@
   origins: ['http://www.google.com/']
 }, function(removed) {
   if (removed) {
     // The permissions have been removed.
   } else {
     // The permissions have not been removed (e.g., you tried to remove
     // required permissions).
   }
 });
 </pre>