handler = function(var_args) {
    'use strict';
    goog.net.Jsonp.cleanup_(id, true);
    replyCallback.apply(undefined, arguments);
  }
This function is the handler for the all-is-well response. It
clears the error timeout handler, calls the user's handler, then
removes the script node and itself.

@param {...Object} var_args The response data sent from the server.