Chooser.php

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<?php
namespace Magento\Cms\Controller\Adminhtml\Block\Widget;

use Magento\Backend\App\Action\Context;
use Magento\Framework\View\LayoutFactory;
use Magento\Framework\Controller\Result\RawFactory;

class Chooser extends \Magento\Backend\App\Action
{
    const ADMIN_RESOURCE = 'Magento_Widget::widget_instance';

    protected $layoutFactory;

    protected $resultRawFactory;

    public function __construct(Context $context, LayoutFactory $layoutFactory, RawFactory $resultRawFactory)
    {
        $this->layoutFactory = $layoutFactory;
        $this->resultRawFactory = $resultRawFactory;
        parent::__construct($context);
    }

    public function execute()
    {
        $layout = $this->layoutFactory->create();

        $uniqId = $this->getRequest()->getParam('uniq_id');
        $pagesGrid = $layout->createBlock(
            \Magento\Cms\Block\Adminhtml\Block\Widget\Chooser::class,
            '',
            ['data' => ['id' => $uniqId]]
        );

        $resultRaw = $this->resultRawFactory->create();
        $resultRaw->setContents($pagesGrid->toHtml());
        return $resultRaw;
    }
}