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diff --git a/web/core/modules/menu_ui/src/Form/MenuDeleteForm.php b/web/core/modules/menu_ui/src/Form/MenuDeleteForm.php
new file mode 100644
index 000000000..1cebd9091
--- /dev/null
+++ b/web/core/modules/menu_ui/src/Form/MenuDeleteForm.php
@@ -0,0 +1,96 @@
+<?php
+
+namespace Drupal\menu_ui\Form;
+
+use Drupal\Core\Database\Connection;
+use Drupal\Core\Entity\EntityDeleteForm;
+use Drupal\Core\Menu\MenuLinkManagerInterface;
+use Drupal\Core\Form\FormStateInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Defines a confirmation form for deletion of a custom menu.
+ */
+class MenuDeleteForm extends EntityDeleteForm {
+
+  /**
+   * The menu link manager.
+   *
+   * @var \Drupal\Core\Menu\MenuLinkManagerInterface
+   */
+  protected $menuLinkManager;
+
+  /**
+   * The database connection.
+   *
+   * @var \Drupal\Core\Database\Connection
+   */
+  protected $connection;
+
+  /**
+   * Constructs a new MenuDeleteForm.
+   *
+   * @param \Drupal\Core\Menu\MenuLinkManagerInterface $menu_link_manager
+   *   The menu link manager.
+   * @param \Drupal\Core\Database\Connection $connection
+   *   The database connection.
+   */
+  public function __construct(MenuLinkManagerInterface $menu_link_manager, Connection $connection) {
+    $this->menuLinkManager = $menu_link_manager;
+    $this->connection = $connection;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('plugin.manager.menu.link'),
+      $container->get('database')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getDescription() {
+    $caption = '';
+    $num_links = $this->menuLinkManager->countMenuLinks($this->entity->id());
+    if ($num_links) {
+      $caption .= '<p>' . $this->formatPlural($num_links, '<strong>Warning:</strong> There is currently 1 menu link in %title. It will be deleted (system-defined items will be reset).', '<strong>Warning:</strong> There are currently @count menu links in %title. They will be deleted (system-defined links will be reset).', ['%title' => $this->entity->label()]) . '</p>';
+    }
+    $caption .= '<p>' . t('This action cannot be undone.') . '</p>';
+    return $caption;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function logDeletionMessage() {
+    $this->logger('menu')->notice('Deleted custom menu %title and all its menu links.', ['%title' => $this->entity->label()]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    // Locked menus may not be deleted.
+    if ($this->entity->isLocked()) {
+      return;
+    }
+
+    // Delete all links to the overview page for this menu.
+    // @todo Add a more generic helper function to the menu link plugin
+    //   manager to remove links to a entity or other ID used as a route
+    //   parameter that is being removed. Also, consider moving this to
+    //   menu_ui.module as part of a generic response to entity deletion.
+    //   https://www.drupal.org/node/2310329
+    $menu_links = $this->menuLinkManager->loadLinksByRoute('entity.menu.edit_form', ['menu' => $this->entity->id()], TRUE);
+    foreach ($menu_links as $id => $link) {
+      $this->menuLinkManager->removeDefinition($id);
+    }
+
+    parent::submitForm($form, $form_state);
+  }
+
+}