Observer.php

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<?php
namespace Magento\Persistent\Model;

class Observer
{
    protected $_persistentSession;

    protected $_layout;

    protected $_url;

    protected $_escaper;

    protected $_customerViewHelper;

    protected $customerRepository;

    public function __construct(
        \Magento\Persistent\Helper\Session $persistentSession,
        \Magento\Framework\UrlInterface $url,
        \Magento\Framework\View\LayoutInterface $layout,
        \Magento\Framework\Escaper $escaper,
        \Magento\Customer\Helper\View $customerViewHelper,
        \Magento\Customer\Api\CustomerRepositoryInterface $customerRepository
    ) {
        $this->_persistentSession = $persistentSession;
        $this->_url = $url;
        $this->_layout = $layout;
        $this->_escaper = $escaper;
        $this->_customerViewHelper = $customerViewHelper;
        $this->customerRepository = $customerRepository;
    }

    public function emulateWelcomeBlock($block)
    {
        $customerName = $this->_customerViewHelper->getCustomerName(
            $this->customerRepository->getById($this->_persistentSession->getSession()->getCustomerId())
        );

        $this->_applyAccountLinksPersistentData();
        $welcomeMessage = __('Welcome, %1!', $customerName);
        $block->setWelcome($welcomeMessage);
        return $this;
    }

    protected function _applyAccountLinksPersistentData()
    {
        if (!$this->_layout->getBlock('header.additional')) {
            $this->_layout->addBlock(\Magento\Persistent\Block\Header\Additional::class, 'header.additional');
        }
    }

    public function emulateTopLinks($block)
    {
        $this->_applyAccountLinksPersistentData();
        $links = $block->getLinks();
        $removeLink = $this->_url->getUrl('customer/account/login');
        foreach ($links as $link) {
            if ($link->getHref() == $removeLink) {
                $this->_layout->unsetChild($block->getNameInLayout(), $link->getNameInLayout());
            }
        }
    }
}