Remove grow box rect support, renderer part.

third_party/WebKit/Source/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 155 matching lines @@
     m_elasticOverscroll = elasticOverscroll;
   }
 
   // Use setNeedsPaintInvalidation to cause the scrollbar (or parts thereof)
   // to repaint.
   bool trackNeedsRepaint() const { return m_trackNeedsRepaint; }
   void clearTrackNeedsRepaint() { m_trackNeedsRepaint = false; }
   bool thumbNeedsRepaint() const { return m_thumbNeedsRepaint; }
   void clearThumbNeedsRepaint() { m_thumbNeedsRepaint = false; }
 
-  bool overlapsResizer() const { return m_overlapsResizer; }
-  void setOverlapsResizer(bool overlapsResizer) {
-    m_overlapsResizer = overlapsResizer;
-  }
-
   // DisplayItemClient methods.
   String debugName() const final {
     return m_orientation == HorizontalScrollbar ? "HorizontalScrollbar"
                                                 : "VerticalScrollbar";
   }
   LayoutRect visualRect() const override;
 
   // Marks the scrollbar as needing to be redrawn.
   //
   // If invalid parts are provided, then those parts will also be repainted.
@@ skipping 41 matching lines @@
   ScrollbarPart m_hoveredPart;
   ScrollbarPart m_pressedPart;
   int m_pressedPos;
   float m_scrollPos;
   bool m_draggingDocument;
   int m_documentDragPos;
 
   bool m_enabled;
 
   Timer<Scrollbar> m_scrollTimer;
-  bool m_overlapsResizer;
 
   float m_elasticOverscroll;
 
  private:
   bool isScrollbar() const override { return true; }
 
   void invalidate() override { setNeedsPaintInvalidation(AllParts); }
   void invalidateRect(const IntRect&) override {
     setNeedsPaintInvalidation(AllParts);
   }
 
   float scrollableAreaCurrentPos() const;
   float scrollableAreaTargetPos() const;
   bool thumbWillBeUnderMouse() const;
 
   bool m_trackNeedsRepaint;
   bool m_thumbNeedsRepaint;
 };
 
 DEFINE_TYPE_CASTS(Scrollbar,
                   Widget,
                   widget,
                   widget->isScrollbar(),
                   widget.isScrollbar());
 
 }  // namespace blink
 
 #endif  // Scrollbar_h