Delete some noop and dead scrollbar code.

sky/engine/platform/scroll/Scrollbar.h

 /*
  * Copyright (C) 2004, 2006 Apple Computer, 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 29 matching lines @@
 class PlatformGestureEvent;
 class PlatformMouseEvent;
 class ScrollableArea;
 
 class PLATFORM_EXPORT Scrollbar final : public Widget {
 public:
     static PassRefPtr<Scrollbar> create(ScrollableArea*, ScrollbarOrientation);
 
     virtual ~Scrollbar();
 
-    ScrollbarOverlayStyle scrollbarOverlayStyle() const;
     bool isScrollableAreaActive() const;
 
     ScrollbarOrientation orientation() const { return m_orientation; }
     bool isLeftSideVerticalScrollbar() const;
 
     int value() const { return lroundf(m_currentPos); }
     float currentPos() const { return m_currentPos; }
     int visibleSize() const { return m_visibleSize; }
     int totalSize() const { return m_totalSize; }
     int maximum() const { return m_totalSize - m_visibleSize; }
 
-    bool enabled() const { return m_enabled; }
-    void setEnabled(bool);
-
     // Called by the ScrollableArea when the scroll offset changes.
     void offsetDidChange();
 
     void disconnectFromScrollableArea() { m_scrollableArea = 0; }
     ScrollableArea* scrollableArea() const { return m_scrollableArea; }
 
     int pressedPos() const { return m_pressedPos; }
 
     void setHoveredPart(ScrollbarPart);
     void setPressedPart(ScrollbarPart);
@@ skipping 70 matching lines @@
     float m_dragOrigin;
 
     // FIXME(sky): Does any of this hovered/pressed tracking do anything
     // since we only have overlay scrollbars?
     ScrollbarPart m_hoveredPart;
     ScrollbarPart m_pressedPart;
     int m_pressedPos;
     float m_scrollPos;
     int m_documentDragPos;
 
-    bool m_enabled;
-
     Timer<Scrollbar> m_scrollTimer;
     bool m_overlapsResizer;
 
 private:
     virtual bool isScrollbar() const override { return true; }
 
     float scrollableAreaCurrentPos() const;
 };
 
 DEFINE_TYPE_CASTS(Scrollbar, Widget, widget, widget->isScrollbar(), widget.isScrollbar());
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_PLATFORM_SCROLL_SCROLLBAR_H_