Revert "Re-land deferred compositing updates with fixed assumptions"

Source/core/rendering/RenderLayerScrollableArea.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 131 matching lines @@
     IntSize adjustedScrollOffset() const { return IntSize(scrollXOffset(), scrollYOffset()); }
 
     void paintResizer(GraphicsContext*, const IntPoint& paintOffset, const IntRect& damageRect);
     void paintOverflowControls(GraphicsContext*, const IntPoint& paintOffset, const IntRect& damageRect, bool paintingOverlayControls);
     void paintScrollCorner(GraphicsContext*, const IntPoint&, const IntRect& damageRect);
 
     // If IntSize is not given, then we must incur additional overhead to instantiate a RenderGeometryMap
     // and compute the correct offset ourselves.
     void positionOverflowControls();
     void positionOverflowControls(const IntSize& offsetFromRoot);
+    void positionNewlyCreatedOverflowControls();
 
     // isPointInResizeControl() is used for testing if a pointer/touch position is in the resize control
     // area.
     bool isPointInResizeControl(const IntPoint& absolutePoint, ResizerHitTestType) const;
     bool hitTestOverflowControls(HitTestResult&, const IntPoint& localPoint);
 
     bool hitTestResizerInFragments(const LayerFragments&, const HitTestLocation&) const;
 
     LayoutRect exposeRect(const LayoutRect&, const ScrollAlignment& alignX, const ScrollAlignment& alignY);
 
@@ skipping 72 matching lines @@
     // Renderers to hold our custom scroll corner.
     RenderScrollbarPart* m_scrollCorner;
 
     // Renderers to hold our custom resizer.
     RenderScrollbarPart* m_resizer;
 };
 
 } // Namespace WebCore
 
 #endif // RenderLayerScrollableArea_h