message: fixup: this is already done in _buildModal
diff: @@ -201,7 +201,6 @@ class ModalManager {
  */
  createDialogAsync(prom, props, className, isPriorityModal, isStaticModal, options = {}) {
  const {modal, closeDialog, onFinishedProm} = this._buildModal(prom, props, className, options);
  - modal.close = closeDialog;
  if (isPriorityModal) {
  // XXX: This is destructive
  this._priorityModal = modal;
  