ProfileForm.php

<?php

namespace Drupal\user;

use Drupal\Core\Form\FormStateInterface;

/**
 * Form handler for the profile forms.
 *
 * @internal
 */
class ProfileForm extends AccountForm {
    
    /**
     * {@inheritdoc}
     */
    protected function actions(array $form, FormStateInterface $form_state) {
        $element = parent::actions($form, $form_state);
        if (!$this->entity
            ->isNew() && $this->entity
            ->hasLinkTemplate('cancel-form')) {
            $route_info = $this->entity
                ->toUrl('cancel-form');
            if ($this->getRequest()->query
                ->has('destination')) {
                $query = $route_info->getOption('query');
                $query['destination'] = $this->getRequest()->query
                    ->get('destination');
                $route_info->setOption('query', $query);
            }
            $element['delete'] = [
                '#type' => 'link',
                '#title' => $this->t('Cancel account'),
                '#access' => $this->entity
                    ->id() > 1 && $this->entity
                    ->access('delete'),
                '#attributes' => [
                    'class' => [
                        'button',
                        'button--danger',
                    ],
                ],
            ];
            $element['delete']['#url'] = $route_info;
        }
        return $element;
    }
    
    /**
     * {@inheritdoc}
     */
    public function save(array $form, FormStateInterface $form_state) {
        $account = $this->entity;
        $account->save();
        $form_state->setValue('uid', $account->id());
        $this->messenger()
            ->addStatus($this->t('The changes have been saved.'));
    }

}