Header.php

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<?php
namespace Magento\Backend\Block\Page;

class Header extends \Magento\Backend\Block\Template
{
    protected $_template = 'Magento_Backend::page/header.phtml';

    protected $_backendData = null;

    protected $_authSession;

    public function __construct(
        \Magento\Backend\Block\Template\Context $context,
        \Magento\Backend\Model\Auth\Session $authSession,
        \Magento\Backend\Helper\Data $backendData,
        array $data = []
    ) {
        $this->_backendData = $backendData;
        $this->_authSession = $authSession;
        parent::__construct($context, $data);
    }

    public function getHomeLink()
    {
        return $this->_backendData->getHomePageUrl();
    }

    public function getUser()
    {
        return $this->_authSession->getUser();
    }

    public function getLogoutLink()
    {
        return $this->getUrl('adminhtml/auth/logout');
    }

    public function displayNoscriptNotice()
    {
        return $this->_scopeConfig->getValue(
            'web/browser_capabilities/javascript',
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        );
    }
}