code: public static Request newDeleteObjectRequest(Session session, String id, Callback callback) {
          return new Request(session, id, null, HttpMethod.DELETE, callback);
      }
docs: Creates a new Request configured to delete a resource through the Graph API.
  
  @param session
  the Session to use, or null; if non-null, the session must be in an opened state
  @param id
  the id of the object to delete
  @param callback
  a callback that will be called when the request is completed to handle success or error conditions
  @return a Request that is ready to execute