public function UserRevokeRole(AuthUserRevokeRoleRequest $argument,
                                   $metadata = [], $options = [])
    {
        return $this->_simpleRequest('/etcdserverpb.Auth/UserRevokeRole',
            $argument,
            ['\Etcdserverpb\AuthUserRevokeRoleResponse', 'decode'],
            $metadata, $options);
    }