Remember.php

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<?php
namespace Magento\Persistent\Block\Form;

class Remember extends \Magento\Framework\View\Element\Template
{
    protected $_persistentData = null;

    protected $mathRandom;

    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Magento\Persistent\Helper\Data $persistentData,
        \Magento\Framework\Math\Random $mathRandom,
        array $data = []
    ) {
        $this->_persistentData = $persistentData;
        $this->mathRandom = $mathRandom;
        parent::__construct($context, $data);
    }

    protected function _toHtml()
    {
        return $this->_persistentData->isEnabled() &&
            $this->_persistentData->isRememberMeEnabled() ? parent::_toHtml() : '';
    }

    public function isRememberMeChecked()
    {
        return $this->_persistentData->isEnabled() &&
            $this->_persistentData->isRememberMeEnabled() &&
            $this->_persistentData->isRememberMeCheckedDefault();
    }

    public function getRandomString($length, $chars = null)
    {
        return $this->mathRandom->getRandomString($length, $chars);
    }
}