Runs the operation specified in $_SESSION['authorize_operation'].
$filetransfer: The FileTransfer object to use for running the operation.
function authorize_run_operation($filetransfer) {
  $operation = $_SESSION['authorize_operation'];
  unset($_SESSION['authorize_operation']);
  if (!empty($operation['page_title'])) {
    drupal_set_title($operation['page_title']);
  }
  require_once DRUPAL_ROOT . '/' . $operation['file'];
  call_user_func_array($operation['callback'], array_merge(array(
    $filetransfer,
  ), $operation['arguments']));
}