Clean up stray references to plugin managers other than ViewsPluginManager.

lib/Drupal/views/Plugin/views/display/DisplayPluginBase.php

@@ -893,7 +893,7 @@ function get_plugin($type = 'style', $name = NULL) {
         $plugin = views_get_plugin($type, $name);
       }
       else {
-        $plugin_type = new QueryPluginManager();
+        $plugin_type = new ViewsPluginManager('query');
         $plugin = $plugin_type->createInstance($name);
       }
 

views_ui.module

@@ -629,7 +629,7 @@ function views_ui_ctools_plugin_type() {
 }
 
 function views_ui_get_form_wizard_instance($wizard) {
-  $manager = new WizardManager();
+  $manager = new ViewsPluginManager('wizard');
   $instance = $manager->createInstance($wizard['name']);
   return $instance;
 }