--- /dev/null
+<?php
+
+namespace Drupal\language\Form;
+
+use Drupal\Core\Form\ConfigFormBaseTrait;
+use Drupal\Core\Form\ConfirmFormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Url;
+
+/**
+ * Defines a confirmation form for deleting a browser language negotiation mapping.
+ */
+class NegotiationBrowserDeleteForm extends ConfirmFormBase {
+ use ConfigFormBaseTrait;
+
+ /**
+ * The browser language code to be deleted.
+ *
+ * @var string
+ */
+ protected $browserLangcode;
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function getEditableConfigNames() {
+ return ['language.mappings'];
+ }
+
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getQuestion() {
+ return $this->t('Are you sure you want to delete %browser_langcode?', ['%browser_langcode' => $this->browserLangcode]);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getCancelUrl() {
+ return new Url('language.negotiation_browser');
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getFormId() {
+ return 'language_negotiation_configure_browser_delete_form';
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function buildForm(array $form, FormStateInterface $form_state, $browser_langcode = NULL) {
+ $this->browserLangcode = $browser_langcode;
+
+ $form = parent::buildForm($form, $form_state);
+
+ return $form;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function submitForm(array &$form, FormStateInterface $form_state) {
+ $this->config('language.mappings')
+ ->clear('map.' . $this->browserLangcode)
+ ->save();
+
+ $args = [
+ '%browser' => $this->browserLangcode,
+ ];
+
+ $this->logger('language')->notice('The browser language detection mapping for the %browser browser language code has been deleted.', $args);
+
+ drupal_set_message($this->t('The mapping for the %browser browser language code has been deleted.', $args));
+
+ $form_state->setRedirect('language.negotiation_browser');
+ }
+
+}