Module.php

    /**
     * Expected to return \Zend\ServiceManager\Config object or array to
     * seed such an object.
     *
     * @return array|\Zend\ServiceManager\Config
     */
    public function getViewHelperConfig()
    {
        return array(
            'initializers' => array(
                function($instance, $viewServiceManager) {

                    if ($instance instanceof ServiceLocatorAwareInterface) {

                        $instance->setServiceLocator($viewServiceManager->getServiceLocator());
                    }
                }
            ),

            'factories' => array(
                'navigation' => function($sm) {

                    $navigation = $sm->get('Zend\View\Helper\Navigation');
                    $navigation->setAcl($sm->getServiceLocator()->get('acl'));
                    $navigation->setRole($sm->getServiceLocator()->get('user_service_auth')->getIdentity()->getRole());

                    return $navigation;
                }
            )
        );
    }

Why you have added an initializers?