Make classes and structures in core/dom fast-allocated.

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 30 matching lines @@
 
 namespace blink {
 
 class LayoutFullScreen;
 class ComputedStyle;
 
 class CORE_EXPORT Fullscreen final
     : public NoBaseWillBeGarbageCollectedFinalized<Fullscreen>
     , public WillBeHeapSupplement<Document>
     , public DocumentLifecycleObserver {
+    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(Fullscreen);
     WILL_BE_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&);
     static bool isActiveFullScreenElement(const Element&);
@@ skipping 67 matching lines @@
 inline Fullscreen* Fullscreen::fromIfExists(Document& document)
 {
     if (!document.hasFullscreenSupplement())
         return 0;
     return fromIfExistsSlow(document);
 }
 
 } // namespace blink
 
 #endif // Fullscreen_h