Issue #1751244 by pcambra, zuuperman: Convert taxonomy module widgets to Plugin system.

core/modules/taxonomy/taxonomy.module

@@ -1031,8 +1031,8 @@ function taxonomy_field_info() {
  * Implements hook_field_widget_info_alter().
  */
 function taxonomy_field_widget_info_alter(&$info) {
-  $info['options_select']['field types'][] = 'taxonomy_term_reference';
-  $info['options_buttons']['field types'][] = 'taxonomy_term_reference';
+  $info['options_select']['field_types'][] = 'taxonomy_term_reference';
+  $info['options_buttons']['field_types'][] = 'taxonomy_term_reference';
 }
 
 /**