node_user_cancel

node_user_cancel($edit, $account, $method)

function node_user_cancel($edit, $account, $method) {
  switch ($method) {
    case 'user_cancel_block_unpublish':
      // Unpublish nodes (current revisions).
      $nids = \Drupal::entityQuery('node')
        ->condition('uid', $account->id())
        ->execute();
      module_load_include('inc', 'node', 'node.admin');
      node_mass_update($nids, array('status' => 0), NULL, TRUE);
      break;

    case 'user_cancel_reassign':
      // Anonymize all of the nodes for this old account.
      module_load_include('inc', 'node', 'node.admin');
      $vids = \Drupal::entityManager()->getStorage('node')->userRevisionIds($account);
      node_mass_update($vids, array(
        'uid' => 0,
        'revision_uid' => 0,
      ), NULL, TRUE, TRUE);
      break;
  }
}