Dynamically generate a heading for Extension Docs API pages

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>
   For general information about permissions and details about each permission,
   see the <a href="declare_permissions.html">declare permissions</a> documentation.
 </p>
 
 <h2 id="howto"> Implementing optional permissions </h2>
 
 <h3 id="types">
   Step 1: Decide which permissions are optional and required
 </h3>
@@ skipping 143 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>