Method unregisterTask

/**
 * Unregister (unmap) a task in the class.
 *
 * @param   string  $task  The task.
 *
 * @return  static  This object to support chaining.
 *
 * @since   3.0
 */
public function unregisterTask($task)
{
    unset($this->taskMap[strtolower($task)]);
    return $this;
}