eZ\Publish\Core\Repository\RoleService::deleteRole PHP Method

    public function deleteRole(APIRole $role)
    {
        if ($this->repository->hasAccess('role', 'delete') !== true) {
            throw new UnauthorizedException('role', 'delete');
        }
        $loadedRole = $this->loadRole($role->id);
        $this->repository->beginTransaction();
        try {
            $this->userHandler->deleteRole($loadedRole->id);
            $this->repository->commit();
        } catch (Exception $e) {
            $this->repository->rollback();
            throw $e;
        }
    }