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

Source/core/paint/DeprecatedPaintLayerScrollableArea.h

 /*
  * Copyright (C) 2003, 2009, 2012 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 45 matching lines @@
     ResizerForPointer,
     ResizerForTouch
 };
 
 class PlatformEvent;
 class LayoutBox;
 class DeprecatedPaintLayer;
 class LayoutScrollbarPart;
 
 class CORE_EXPORT DeprecatedPaintLayerScrollableArea final : public NoBaseWillBeGarbageCollectedFinalized<DeprecatedPaintLayerScrollableArea>, public ScrollableArea {
+    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(DeprecatedPaintLayerScrollableArea);
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(DeprecatedPaintLayerScrollableArea);
     friend class Internals;
 
 public:
     // FIXME: We should pass in the LayoutBox but this opens a window
     // for crashers during DeprecatedPaintLayer setup (see crbug.com/368062).
     static PassOwnPtrWillBeRawPtr<DeprecatedPaintLayerScrollableArea> create(DeprecatedPaintLayer& layer)
     {
         return adoptPtrWillBeNoop(new DeprecatedPaintLayerScrollableArea(layer));
     }
@@ skipping 225 matching lines @@
     LayoutScrollbarPart* m_resizer;
 
 #if ENABLE(ASSERT)
     bool m_hasBeenDisposed;
 #endif
 };
 
 } // namespace blink
 
 #endif // LayerScrollableArea_h