Secure.php

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<?php
namespace Magento\Config\Model\Config\Backend;

class Secure extends \Magento\Framework\App\Config\Value
{
    protected $_mergeService;

    public function __construct(
        \Magento\Framework\Model\Context $context,
        \Magento\Framework\Registry $registry,
        \Magento\Framework\App\Config\ScopeConfigInterface $config,
        \Magento\Framework\App\Cache\TypeListInterface $cacheTypeList,
        \Magento\Framework\View\Asset\MergeService $mergeService,
        \Magento\Framework\Model\ResourceModel\AbstractResource $resource = null,
        \Magento\Framework\Data\Collection\AbstractDb $resourceCollection = null,
        array $data = []
    ) {
        $this->_mergeService = $mergeService;
        parent::__construct($context, $registry, $config, $cacheTypeList, $resource, $resourceCollection, $data);
    }

    public function afterSave()
    {
        if ($this->isValueChanged()) {
            $this->_mergeService->cleanMergedJsCss();
        }
        return parent::afterSave();
    }
}