newsupernova/app/code/Smartwave/Porto/Controller/Adminhtml/System/Config/Demo.php

<?php

namespace Smartwave\Porto\Controller\Adminhtml\System\Config;

abstract class Demo extends \Magento\Backend\App\Action {
    protected function _import()
    {
        return $this->_objectManager->get('Smartwave\Porto\Model\Import\Demo')
            ->importDemo($this->getRequest()->getParam('demo_version'),$this->getRequest()->getParam('current_store'),$this->getRequest()->getParam('current_website'));
    }
}