Countries.php

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<?php
namespace Magento\Braintree\Block\Adminhtml\Form\Field;

use Magento\Braintree\Helper\Country;
use Magento\Framework\View\Element\Context;
use Magento\Framework\View\Element\Html\Select;

class Countries extends Select
{
    private $countryHelper;

    public function __construct(Context $context, Country $countryHelper, array $data = [])
    {
        parent::__construct($context, $data);
        $this->countryHelper = $countryHelper;
    }

    protected function _toHtml()
    {
        if (!$this->getOptions()) {
            $this->setOptions($this->countryHelper->getCountries());
        }
        return parent::_toHtml();
    }

    public function setInputName($value)
    {
        return $this->setName($value);
    }
}