Pass implementation object to supplemental classes by reference

Source/modules/notifications/WorkerGlobalScopeNotifications.h

Index: Source/modules/notifications/WorkerGlobalScopeNotifications.h
diff --git a/Source/modules/notifications/WorkerGlobalScopeNotifications.h b/Source/modules/notifications/WorkerGlobalScopeNotifications.h
index a369071c3e9ae8bc967d7572c7838a41ee3e2f93..d62d35887a0876ac7400714dfeb7fdb3d85885a1 100644
--- a/Source/modules/notifications/WorkerGlobalScopeNotifications.h
+++ b/Source/modules/notifications/WorkerGlobalScopeNotifications.h
@@ -42,16 +42,16 @@ class WorkerGlobalScopeNotifications FINAL : public WorkerSupplement {
 public:
     virtual ~WorkerGlobalScopeNotifications();
 
-    static NotificationCenter* webkitNotifications(WorkerGlobalScope*);
-    static WorkerGlobalScopeNotifications* from(WorkerGlobalScope*);
+    static NotificationCenter* webkitNotifications(WorkerGlobalScope&);
+    static WorkerGlobalScopeNotifications& from(WorkerGlobalScope&);
 
 private:
-    explicit WorkerGlobalScopeNotifications(WorkerGlobalScope*);
+    explicit WorkerGlobalScopeNotifications(WorkerGlobalScope&);
 
     NotificationCenter* webkitNotifications();
     static const char* supplementName();
 
-    WorkerGlobalScope* m_context;
+    WorkerGlobalScope& m_context;
     RefPtrWillBePersistent<NotificationCenter> m_notificationCenter;
 };