Config.php

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<?php
namespace Magento\Quote\Model\Quote;

class Config
{
    private $_attributeConfig;

    public function __construct(\Magento\Catalog\Model\Attribute\Config $attributeConfig)
    {
        $this->_attributeConfig = $attributeConfig;
    }

    public function getProductAttributes()
    {
        return $this->_attributeConfig->getAttributeNames('quote_item');
    }
}