Remove invoking the focusNavigationHeuristics() in other files

Author: jihyerish

demo/calendar/calendar-utils.js

@@ -192,6 +192,4 @@
     </div>
   </body>
   <script src="../../polyfill/spatnav-heuristic.js"></script>
-  <script src="../../polyfill/spatnav-api.js"></script>
-  <script src="calendar-utils.js"></script>
 </html>