user_role_revoke_permissions

user_role_revoke_permissions($rid, array $permissions = array())

function user_role_revoke_permissions($rid, array $permissions = array()) {
  // Revoke permissions for the role.
  $role = Role::load($rid);
  foreach ($permissions as $permission) {
    $role->revokePermission($permission);
  }
  $role->trustData()->save();
}