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

<?php

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

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