Delete.php

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<?php
namespace Magento\Widget\Controller\Adminhtml\Widget\Instance;

class Delete extends \Magento\Widget\Controller\Adminhtml\Widget\Instance
{
    public function execute()
    {
        $widgetInstance = $this->_initWidgetInstance();
        if ($widgetInstance) {
            try {
                $widgetInstance->delete();
                $this->messageManager->addSuccess(__('The widget instance has been deleted.'));
            } catch (\Exception $e) {
                $this->messageManager->addError($e->getMessage());
            }
        }
        $this->_redirect('adminhtml/*/');
        return;
    }
}