DeleteCmsGoogleExperimentScriptObserver.php

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<?php
namespace Magento\GoogleOptimizer\Observer\CmsPage;

use Magento\Framework\Event\ObserverInterface;

class DeleteCmsGoogleExperimentScriptObserver implements ObserverInterface
{
    protected $_modelCode;

    public function __construct(\Magento\GoogleOptimizer\Model\Code $modelCode)
    {
        $this->_modelCode = $modelCode;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $cmsPage = $observer->getEvent()->getObject();
        $this->_modelCode->loadByEntityIdAndType(
            $cmsPage->getId(),
            \Magento\GoogleOptimizer\Model\Code::ENTITY_TYPE_PAGE
        );
        if ($this->_modelCode->getId()) {
            $this->_modelCode->delete();
        }
        return $this;
    }
}