HeapSupplements are now just Supplements.

third_party/WebKit/Source/core/dom/Fullscreen.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
@@ skipping 28 matching lines @@
 #include "wtf/RefPtr.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class LayoutFullScreen;
 class ComputedStyle;
 
 class CORE_EXPORT Fullscreen final
     : public GarbageCollectedFinalized<Fullscreen>
-    , public HeapSupplement<Document>
+    , public Supplement<Document>
     , public DocumentLifecycleObserver {
     USING_GARBAGE_COLLECTED_MIXIN(Fullscreen);
 public:
     virtual ~Fullscreen();
     static const char* supplementName();
     static Fullscreen& from(Document&);
     static Fullscreen* fromIfExists(Document&);
     static Element* fullscreenElementFrom(Document&);
     static Element* currentFullScreenElementFrom(Document&);
     static bool isFullScreen(Document&);
@@ skipping 68 matching lines @@
 inline Fullscreen* Fullscreen::fromIfExists(Document& document)
 {
     if (!document.hasFullscreenSupplement())
         return 0;
     return fromIfExistsSlow(document);
 }
 
 } // namespace blink
 
 #endif // Fullscreen_h