array $modules: The array of modules.
Overrides ConfirmFormBase::buildForm
public function buildForm(array $form, array &$form_state, $modules = array()) {
  $uninstall = array();
  // Construct the hidden form elements and list items.
  foreach ($modules as $module => $value) {
    $info = drupal_parse_info_file(drupal_get_path('module', $module) . '/' . $module . '.info.yml');
    $uninstall[] = $info['name'];
    $form['uninstall'][$module] = array(
      '#type' => 'hidden',
      '#value' => 1,
    );
  }
  $form['#confirmed'] = TRUE;
  $form['uninstall']['#tree'] = TRUE;
  $form['text'] = array(
    '#markup' => '<p>' . t('The following modules will be completely uninstalled from your site, and <em>all data from these modules will be lost</em>!') . '</p>',
  );
  $form['modules'] = array(
    '#theme' => 'item_list',
    '#items' => $uninstall,
  );
  return parent::buildForm($form, $form_state);
}