Issue #2061967 by Maxis, sergeypavlenko, m1r1k: Remove calls to deprecated...

Issue #2061967 by Maxis, sergeypavlenko, m1r1k: Remove calls to deprecated global  in overlay module.

core/modules/overlay/lib/Drupal/overlay/EventSubscriber/OverlaySubscriber.php

@@ -72,7 +72,7 @@ public function onRequest(GetResponseEvent $event) {
       // Only act on html pages.
       return;
     }
-    global $user;
+    $user = \Drupal::currentUser();
 
     $mode = overlay_get_mode();
 

core/modules/overlay/overlay.module

@@ -216,7 +216,7 @@ function overlay_page_alter(&$page) {
  * @see http://drupal.org/node/890284
  */
 function overlay_disable_message() {
-  global $user;
+  $user = \Drupal::currentUser();
 
   $build = array();
   if ($user->isAnonymous() || !$user->hasPermission('access overlay')) {