Remove a bunch of frame-level scrolling machinery.

sky/engine/platform/scroll/ScrollableArea.h

 /*
  * Copyright (C) 2008, 2011 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 73 matching lines @@
     void setVerticalScrollElasticity(ScrollElasticity scrollElasticity) { m_verticalScrollElasticity = scrollElasticity; }
     ScrollElasticity verticalScrollElasticity() const { return static_cast<ScrollElasticity>(m_verticalScrollElasticity); }
 
     void setHorizontalScrollElasticity(ScrollElasticity scrollElasticity) { m_horizontalScrollElasticity = scrollElasticity; }
     ScrollElasticity horizontalScrollElasticity() const { return static_cast<ScrollElasticity>(m_horizontalScrollElasticity); }
 
     bool inLiveResize() const { return m_inLiveResize; }
     void willStartLiveResize();
     void willEndLiveResize();
 
-    void contentAreaWillPaint() const;
     void mouseEnteredContentArea() const;
     void mouseExitedContentArea() const;
     void mouseMovedInContentArea() const;
     void mouseEnteredScrollbar(Scrollbar*) const;
     void mouseExitedScrollbar(Scrollbar*) const;
     void contentAreaDidShow() const;
     void contentAreaDidHide() const;
 
     void finishCurrentScrollAnimations() const;
 
@@ skipping 61 matching lines @@
 
     virtual IntRect visibleContentRect(IncludeScrollbarsInRect = ExcludeScrollbars) const;
     virtual int visibleHeight() const = 0;
     virtual int visibleWidth() const = 0;
     virtual IntSize contentsSize() const = 0;
     virtual IntSize overhangAmount() const { return IntSize(); }
     virtual IntPoint lastKnownMousePosition() const { return IntPoint(); }
 
     virtual bool shouldSuspendScrollAnimations() const { return true; }
 
-    virtual bool scrollbarsCanBeActive() const = 0;
-
     // Returns the bounding box of this scrollable area, in the coordinate system of the enclosing scroll view.
     virtual IntRect scrollableAreaBoundingBox() const = 0;
 
     virtual bool scrollAnimatorEnabled() const { return false; }
 
     // NOTE: Only called from Internals for testing.
     void setScrollOffsetFromInternals(const IntPoint&);
 
     IntPoint clampScrollPosition(const IntPoint&) const;
 
@@ skipping 103 matching lines @@
     // vertical-lr / ltr            NO                      NO
     // vertical-lr / rtl            NO                      YES
     // vertical-rl / ltr            YES                     NO
     // vertical-rl / rtl            YES                     YES
     IntPoint m_scrollOrigin;
 };
 
 } // namespace blink
 
 #endif // ScrollableArea_h