Fix invalidation during painting of scrollbars

Source/core/layout/LayerScrollableArea.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 154 matching lines @@
     LayoutUnit scrollWidth() const;
     LayoutUnit scrollHeight() const;
     int pixelSnappedScrollWidth() const;
     int pixelSnappedScrollHeight() const;
 
     int verticalScrollbarWidth(OverlayScrollbarSizeRelevancy = IgnoreOverlayScrollbarSize) const;
     int horizontalScrollbarHeight(OverlayScrollbarSizeRelevancy = IgnoreOverlayScrollbarSize) const;
 
     DoubleSize adjustedScrollOffset() const { return DoubleSize(scrollXOffset(), scrollYOffset()); }
 
-    void positionOverflowControls(const IntSize& offsetFromRoot);
+    void positionOverflowControls();
 
     // 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 94 matching lines @@
     // Renderers to hold our custom scroll corner.
     RenderScrollbarPart* m_scrollCorner;
 
     // Renderers to hold our custom resizer.
     RenderScrollbarPart* m_resizer;
 };
 
 } // namespace blink
 
 #endif // LayerScrollableArea_h