Notification should not leak document.

Source/modules/notifications/Notification.h

Index: Source/modules/notifications/Notification.h
diff --git a/Source/modules/notifications/Notification.h b/Source/modules/notifications/Notification.h
index 3441885989304abd7d11de519fe7fc4f1ca0a847..560abce05be7c157e5890320edf3cb8224845c8b 100644
--- a/Source/modules/notifications/Notification.h
+++ b/Source/modules/notifications/Notification.h
@@ -33,7 +33,7 @@
 #define Notification_h
 
 #include "bindings/v8/ScriptWrappable.h"
-#include "core/dom/ActiveDOMObject.h"
+#include "core/dom/ContextLifecycleObserver.h"
 #include "core/dom/EventNames.h"
 #include "core/dom/EventTarget.h"
 #include "core/loader/ThreadableLoaderClient.h"
@@ -63,7 +63,7 @@ class ResourceResponse;
 class ScriptExecutionContext;
 class ThreadableLoader;
 
-class Notification : public RefCounted<Notification>, public ScriptWrappable, public ActiveDOMObject, public EventTarget {
+class Notification : public RefCounted<Notification>, public ScriptWrappable, public ContextLifecycleObserver, public EventTarget {
     WTF_MAKE_FAST_ALLOCATED;
 public:
     Notification();
@@ -122,9 +122,9 @@ public:
 
     // EventTarget interface
     virtual const AtomicString& interfaceName() const;
-    virtual ScriptExecutionContext* scriptExecutionContext() const { return ActiveDOMObject::scriptExecutionContext(); }
+    virtual ScriptExecutionContext* scriptExecutionContext() const { return ContextLifecycleObserver::scriptExecutionContext(); }
 
-    // ActiveDOMObject interface
+    // ContextLifecycleObserver interface
     virtual void contextDestroyed();
 
     void stopLoadingIcon();