code: function _handleTimeout(id, callback) {
                  // Handle timeout
                  if (id && "function" === typeof callback) {
                      try {
                          callback.call(null, new Error("Callback: Operation Timeout!"));
                      }
                      catch (ex) {
                          /* istanbul ignore next  */
                          PostMessageUtilities.log("Error while trying to handle the timeout using the callback", "ERROR", "PostMessageCourier");
                      }
                  }
              }
docs: Method for handling timeout of a cached callback
  @param {String} id - the id of the timed out callback
  @param {Function} callback - the callback object from cache
  @private