materio-base-d7/sites/all/modules/contrib/dev/background_process/background_batch/background_batch.install

<?php
/**
 * @file
 * This is the installation file for the Background Batch submodule
 */

/**
 * Implements hook_uninstall().
 */
function background_batch_uninstall() {
  // Removing used variables.
  variable_del('background_batch_delay');
  variable_del('background_batch_process_lifespan');
  variable_del('background_batch_show_eta');
}