DeniedIframe.php

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<?php
namespace Magento\Backend\Controller\Adminhtml\Auth;

class DeniedIframe extends \Magento\Backend\Controller\Adminhtml\Auth
{
    protected $resultRawFactory;

    public function __construct(
        \Magento\Backend\App\Action\Context $context,
        \Magento\Framework\Controller\Result\RawFactory $resultRawFactory
    ) {
        parent::__construct($context);
        $this->resultRawFactory = $resultRawFactory;
    }

    protected function _getDeniedIframe()
    {
        return '<script>parent.window.location = \''
            . $this->_helper->getHomePageUrl() . '\';</script>';
    }

    public function execute()
    {
        $resultRaw = $this->resultRawFactory->create();
        return $resultRaw->setContents($this->_getDeniedIframe());
    }
}