Issue #2010982 by somepal, andypost, pplantinga | Samvel: Replace theme() with...

Issue #2010982 by somepal, andypost, pplantinga | Samvel: Replace theme() with drupal_render() in system module for system_status().

core/modules/system/lib/Drupal/system/Controller/SystemInfoController.php

@@ -53,7 +53,7 @@ public function __construct(SystemManager $systemManager) {
   public function status() {
     $requirements = $this->systemManager->listRequirements();
     $this->systemManager->fixAnonymousUid();
-    return theme('status_report', array('requirements' => $requirements));
+    return array('#theme' => 'status_report', '#requirements' => $requirements);
   }
 
   /**