diff --git a/core/lib/Drupal/Core/Form/FormBuilder.php b/core/lib/Drupal/Core/Form/FormBuilder.php
index cbaf9080830a827ae55b7c795c67fc6cb9fdc547..036339987538a9cd7e40064baed4faecdbe2fec1 100644
--- a/core/lib/Drupal/Core/Form/FormBuilder.php
+++ b/core/lib/Drupal/Core/Form/FormBuilder.php
@@ -478,21 +478,6 @@ public function retrieveForm($form_id, &$form_state) {
     // Record the $form_id.
     $form_state['build_info']['form_id'] = $form_id;
 
-    // Record the filepath of the include file containing the original form, so
-    // the form builder callbacks can be loaded when the form is being rebuilt
-    // from cache on a different path (such as 'system/ajax'). See
-    // self::getCache(). Don't do this in maintenance mode as Drupal may not be
-    // fully bootstrapped (i.e. during installation) in which case
-    // menu_get_item() is not available.
-    if (!isset($form_state['build_info']['files']['menu']) && !defined('MAINTENANCE_MODE')) {
-      $item = $this->menuGetItem();
-      if (!empty($item['include_file'])) {
-        // Do not use form_load_include() here, as the file is already loaded.
-        // Anyway, self::getCache() is able to handle filepaths too.
-        $form_state['build_info']['files']['menu'] = $item['include_file'];
-      }
-    }
-
     // We save two copies of the incoming arguments: one for modules to use
     // when mapping form ids to constructor functions, and another to pass to
     // the constructor function itself.
@@ -1701,15 +1686,6 @@ protected function drupalInstallationAttempted() {
     return drupal_installation_attempted();
   }
 
-  /**
-   * Wraps menu_get_item().
-   *
-   * @return array|bool
-   */
-  protected function menuGetItem() {
-    return menu_get_item();
-  }
-
   /**
    * Wraps watchdog().
    */
diff --git a/core/tests/Drupal/Tests/Core/Form/FormBuilderTest.php b/core/tests/Drupal/Tests/Core/Form/FormBuilderTest.php
index b0779bd707eb7c97f0eca499e48b14bd725cefdf..20c13df8b56980bab521debfcc52b0429ef19548 100644
--- a/core/tests/Drupal/Tests/Core/Form/FormBuilderTest.php
+++ b/core/tests/Drupal/Tests/Core/Form/FormBuilderTest.php
@@ -635,13 +635,6 @@ protected function drupalInstallationAttempted() {
     return FALSE;
   }
 
-  /**
-   * {@inheritdoc}
-   */
-  protected function menuGetItem() {
-    return FALSE;
-  }
-
   /**
    * {@inheritdoc}
    */