Remove a bunch of frame-level scrolling machinery.

sky/engine/core/page/ChromeClient.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple, Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  * Copyright (C) 2012 Samsung Electronics. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 81 matching lines @@
     virtual void setCursor(const Cursor&) = 0;
     virtual void scheduleAnimation() = 0;
     // End methods used by HostWindow.
 
     virtual void layoutUpdated(LocalFrame*) const { }
 
     virtual void mouseDidMoveOverElement(const HitTestResult&, unsigned modifierFlags) = 0;
 
     virtual void setToolTip(const String&, TextDirection) = 0;
 
-    virtual bool paintCustomOverhangArea(GraphicsContext*, const IntRect&, const IntRect&, const IntRect&) = 0;
-
     // Allows ports to customize the type of graphics layers created by this page.
     virtual GraphicsLayerFactory* graphicsLayerFactory() const { return 0; }
 
     // Pass 0 as the GraphicsLayer to detatch the root layer.
     virtual void attachRootGraphicsLayer(GraphicsLayer*) = 0;
 
     virtual void clearCompositedSelectionBounds() { }
 
     virtual void needTouchEvents(bool) = 0;
 
@@ skipping 20 matching lines @@
     virtual void willSetInputMethodState() { }
     virtual void didUpdateTextOfFocusedElementByNonUserInput() { }
     virtual void showImeIfNeeded() { }
 
 protected:
     virtual ~ChromeClient() { }
 };
 
 }
 #endif // ChromeClient_h