popsu-d7/sites/all/modules/mb/mb_user/mb_user.install

<?php

/**
 * @file
 * Installs, updates, and uninstalls More Buttons User.
 */

/**
 * Implements hook_uninstall().
 */
function mb_user_uninstall() {
  // Remove variables.
  $page_types = array_keys(mb_user_type_get_types());
  foreach ($page_types as $type) {
    variable_del('mb_content_cancel_' . $type);
    variable_del('mb_content_sac_' . $type);
    variable_del('mb_content_sacn_' . $type);
  }
}