diff --git a/core/modules/field/field.install b/core/modules/field/field.install
index 6990a91..0fa04fa 100644
--- a/core/modules/field/field.install
+++ b/core/modules/field/field.install
@@ -54,120 +54,6 @@ function _update_8000_field_create_field(array &$field_config) {
 }
 
 /**
- * Deletes a field directly from configuration.
- *
- * To protect user data, this function can only be used to delete fields once
- * all information it stored is gone. Delete all data from the
- * field_data_$field_name table before calling by either manually issuing
- * delete queries against it or using _update_8000_field_delete_instance().
- *
- * @param string $field_name
- *   The field name to delete.
- *
- * @ingroup update_api
- */
-function _update_8000_field_delete_field($field_name) {
-  $table_name = 'field_data_' . $field_name;
-  if (db_select($table_name)->range(0, 1)->countQuery()->execute()->fetchField()) {
-    $t = get_t();
-    throw new Exception($t('This function can only be used to delete fields without data'));
-  }
-  // Delete all instances.
-  $config_names = config_get_storage_names_with_prefix('field.instance');
-  foreach ($config_names as $id) {
-    list(, , $entity_type, $bundle, $config_field_name) = explode('.', $id);
-    if ($config_field_name == $field_name) {
-      update_config_remove_config('field.instance', $entity_type . '.' . $bundle . '.' . $field_name);
-    }
-  }
-
-  // Nuke field data and revision tables.
-  db_drop_table($table_name);
-  db_drop_table('field_revision_' . $field_name);
-
-  // Delete the field.
-  update_config_remove_config('field.field', $field_name);
-}
-
-/**
- * Deletes an instance and all its data of a field stored in configuration.
- *
- * BEWARE: This function deletes user data from the field storage tables.
- *
- * @param string $field_name
- *   The name of the field.
- * @param string $entity_type
- *   The name of the entity type.
- * @param $bundle
- *   The name of the bundle.
- *
- * @ingroup update_api
- */
-function _update_8000_field_delete_instance($field_name, $entity_type, $bundle) {
-  // Delete field instance configuration data.
-  update_config_remove_config('field.instance', $entity_type . '.' . $bundle . '.' . $field_name);
-
-  // Nuke data.
-  db_delete('field_data_' . $field_name)
-    ->condition('entity_type', $entity_type)
-    ->condition('bundle', $bundle)
-    ->execute();
-  db_delete('field_revision_' . $field_name)
-    ->condition('entity_type', $entity_type)
-    ->condition('bundle', $bundle)
-    ->execute();
-}
-
-/**
- * Fetches all of the field definitions from configuration.
- *
- * Warning: Unlike the field_read_fields() API function, this function returns
- * all fields by default, including deleted and inactive fields, unless
- * specified otherwise in the $conditions parameter.
- *
- * @param $conditions
- *   An array of conditions to limit the select query to.
- * @param $key
- *   The name of the field property the return array is indexed by. Using
- *   anything else than 'id' might cause incomplete results if the $conditions
- *   do not filter out deleted fields.
- *
- * @return
- *   An array of fields matching $conditions, keyed by the property specified
- *   by the $key parameter.
- * @ingroup update_api
- */
-function _update_8000_field_read_fields(array $conditions = array(), $key = 'id') {
-  $matching_fields = array();
-
-  $config_names = config_get_storage_names_with_prefix('field.field');
-  $config_names += Drupal::state()->get('field.field.deleted') ?: array();
-
-  if (empty($config_names)) {
-    return array();
-  }
-
-  // Collect matching fields.
-  foreach ($config_names as $field) {
-    if (!is_array($field)) {
-      $field = config($field)->get();
-    }
-
-    if (!empty($conditions)) {
-      foreach ($conditions as $key => $value) {
-        if ($field[$key] != $value) {
-          continue 2;
-        }
-      }
-    }
-
-    $matching_fields[$field[$key]] = $field;
-  }
-
-  return $matching_fields;
-}
-
-/**
  * Writes a field instance directly to configuration.
  *
  * @param array $field_config