public void setOwner(final UserRef owner) {
        clear();
        this.owner = owner;
        criteriaBuilder.owner(owner);
        refresh();
    }
Set the user so the screen can only show one user. No quick filter is set.
Only use on an embedded Api keys list for ONE user.
stroom-core-client/src/main/java/stroom/security/client/presenter/ApiKeysListPresenter.java