popsu-d7/sites/all/modules/admin/admin.install

<?php

/**
 * @file
 * Install, update and uninstall functions for the admin module.
 */

/**
 * Implements hook_uninstall().
 */
function admin_uninstall() {
  variable_del('admin_toolbar');
}

/**
 * Implements hook_enable().
 */
function admin_enable() {
  // Weight admin to come after other modules -- in particular, admin_theme().
  db_update('system')
    ->fields(array('weight' => 1))
    ->condition('name', 'admin')
    ->condition('type', 'module')
    ->execute();
}