Cart.php

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<?php
namespace Magento\Customer\Controller\Adminhtml\Index;

use Magento\Customer\Api\AccountManagementInterface;
use Magento\Customer\Api\AddressRepositoryInterface;
use Magento\Customer\Api\CustomerRepositoryInterface;
use Magento\Customer\Api\Data\AddressInterfaceFactory;
use Magento\Customer\Api\Data\CustomerInterfaceFactory;
use Magento\Customer\Model\Address\Mapper;
use Magento\Framework\DataObjectFactory as ObjectFactory;
use Magento\Framework\Api\DataObjectHelper;

class Cart extends \Magento\Customer\Controller\Adminhtml\Index
{
    private $quoteFactory;

    public function __construct(
        \Magento\Backend\App\Action\Context $context,
        \Magento\Framework\Registry $coreRegistry,
        \Magento\Framework\App\Response\Http\FileFactory $fileFactory,
        \Magento\Customer\Model\CustomerFactory $customerFactory,
        \Magento\Customer\Model\AddressFactory $addressFactory,
        \Magento\Customer\Model\Metadata\FormFactory $formFactory,
        \Magento\Newsletter\Model\SubscriberFactory $subscriberFactory,
        \Magento\Customer\Helper\View $viewHelper,
        \Magento\Framework\Math\Random $random,
        CustomerRepositoryInterface $customerRepository,
        \Magento\Framework\Api\ExtensibleDataObjectConverter $extensibleDataObjectConverter,
        Mapper $addressMapper,
        AccountManagementInterface $customerAccountManagement,
        AddressRepositoryInterface $addressRepository,
        CustomerInterfaceFactory $customerDataFactory,
        AddressInterfaceFactory $addressDataFactory,
        \Magento\Customer\Model\Customer\Mapper $customerMapper,
        \Magento\Framework\Reflection\DataObjectProcessor $dataObjectProcessor,
        DataObjectHelper $dataObjectHelper,
        ObjectFactory $objectFactory,
        \Magento\Framework\View\LayoutFactory $layoutFactory,
        \Magento\Framework\View\Result\LayoutFactory $resultLayoutFactory,
        \Magento\Framework\View\Result\PageFactory $resultPageFactory,
        \Magento\Backend\Model\View\Result\ForwardFactory $resultForwardFactory,
        \Magento\Framework\Controller\Result\JsonFactory $resultJsonFactory,
        \Magento\Quote\Model\QuoteFactory $quoteFactory = null
    ) {
        parent::__construct(
            $context,
            $coreRegistry,
            $fileFactory,
            $customerFactory,
            $addressFactory,
            $formFactory,
            $subscriberFactory,
            $viewHelper,
            $random,
            $customerRepository,
            $extensibleDataObjectConverter,
            $addressMapper,
            $customerAccountManagement,
            $addressRepository,
            $customerDataFactory,
            $addressDataFactory,
            $customerMapper,
            $dataObjectProcessor,
            $dataObjectHelper,
            $objectFactory,
            $layoutFactory,
            $resultLayoutFactory,
            $resultPageFactory,
            $resultForwardFactory,
            $resultJsonFactory
        );
        $this->quoteFactory = $quoteFactory ?: $this->_objectManager->get(\Magento\Quote\Model\QuoteFactory::class);
    }

    public function execute()
    {
        $customerId = $this->initCurrentCustomer();
        $websiteId = $this->getRequest()->getParam('website_id');

        // delete an item from cart
        $deleteItemId = $this->getRequest()->getPost('delete');
        if ($deleteItemId) {
            $quoteRepository = $this->_objectManager->create(\Magento\Quote\Api\CartRepositoryInterface::class);
            try {
                $quote = $quoteRepository->getForCustomer($customerId);
            } catch (\Magento\Framework\Exception\NoSuchEntityException $e) {
                $quote = $this->quoteFactory->create();
            }
            $quote->setWebsite(
                $this->_objectManager->get(\Magento\Store\Model\StoreManagerInterface::class)->getWebsite($websiteId)
            );
            $item = $quote->getItemById($deleteItemId);
            if ($item && $item->getId()) {
                $quote->removeItem($deleteItemId);
                $quoteRepository->save($quote->collectTotals());
            }
        }

        $resultLayout = $this->resultLayoutFactory->create();
        $resultLayout->getLayout()->getBlock('admin.customer.view.edit.cart')->setWebsiteId($websiteId);
        return $resultLayout;
    }
}