Remove IDE warnings.

Author: ludo

managed_vms/async-rest/src/main/java/com/google/appengine/demos/asyncrest/AbstractRestServlet.java

@@ -116,6 +116,7 @@ protected int width(long nano) {
     return w;
   }
 
+  @Override
   protected void doPost(HttpServletRequest request, HttpServletResponse response)
           throws ServletException, IOException {
     doGet(request, response);

managed_vms/async-rest/src/main/java/com/google/appengine/demos/asyncrest/SerialRestServlet.java

@@ -28,6 +28,7 @@
  */
 public class SerialRestServlet extends AbstractRestServlet {
 
+  @Override
   protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
     if (key == null) {
       response.sendError(500, APPKEY + " not set");
@@ -96,6 +97,7 @@ protected void doGet(HttpServletRequest request, HttpServletResponse response) t
    * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
    * response)
    */
+  @Override
   protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
     doGet(request, response);
   }