Grid.php

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Sales\Controller\Adminhtml\Creditmemo\AbstractCreditmemo;

class Grid extends \Magento\Backend\App\Action
{
    /**
     * Authorization level of a basic admin session
     *
     * @see _isAllowed()
     */
    const ADMIN_RESOURCE = 'Magento_Sales::sales_creditmemo';

    /**
     * @var \Magento\Framework\View\Result\LayoutFactory
     */
    protected $resultLayoutFactory;

    /**
     * @param \Magento\Backend\App\Action\Context $context
     * @param \Magento\Framework\View\Result\LayoutFactory $resultLayoutFactory
     */
    public function __construct(
        \Magento\Backend\App\Action\Context $context,
        \Magento\Framework\View\Result\LayoutFactory $resultLayoutFactory
    ) {
        $this->resultLayoutFactory = $resultLayoutFactory;
        parent::__construct($context);
    }

    /**
     * Creditmemo grid
     *
     * @return \Magento\Framework\View\Result\Layout
     */
    public function execute()
    {
        $resultLayout = $this->resultLayoutFactory->create();
        return $resultLayout;
    }
}