AjaxDelete.php

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<?php
namespace Magento\Tax\Controller\Adminhtml\Rate;

use Magento\Framework\Controller\ResultFactory;

class AjaxDelete extends \Magento\Tax\Controller\Adminhtml\Rate
{
    public function execute()
    {
        $rateId = (int)$this->getRequest()->getParam('tax_calculation_rate_id');
        try {
            $this->_taxRateRepository->deleteById($rateId);
            $responseContent = ['success' => true, 'error_message' => ''];
        } catch (\Magento\Framework\Exception\LocalizedException $e) {
            $responseContent = ['success' => false, 'error_message' => $e->getMessage()];
        } catch (\Exception $e) {
            $responseContent = [
                'success' => false,
                'error_message' => __('We can\'t delete this tax rate right now.')
            ];
        }

        $resultJson = $this->resultFactory->create(ResultFactory::TYPE_JSON);
        $resultJson->setData($responseContent);
        return $resultJson;
    }
}