Don't call into ScrollView from Scrollbar.

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 23 matching lines @@
 #include "wtf/PassRefPtr.h"
 
 namespace blink {
 
 class GraphicsContext;
 class IntRect;
 class PlatformGestureEvent;
 class PlatformMouseEvent;
 class ScrollableArea;
 class ScrollbarTheme;
-class ScrollView;
 
 class PLATFORM_EXPORT Scrollbar : public Widget,
                   public ScrollbarThemeClient {
 
 public:
     static PassRefPtr<Scrollbar> create(ScrollableArea*, ScrollbarOrientation, ScrollbarControlSize);
 
     virtual ~Scrollbar();
 
     // ScrollbarThemeClient implementation.
     virtual int x() const OVERRIDE { return Widget::x(); }
     virtual int y() const OVERRIDE { return Widget::y(); }
     virtual int width() const OVERRIDE { return Widget::width(); }
     virtual int height() const OVERRIDE { return Widget::height(); }
     virtual IntSize size() const OVERRIDE { return Widget::size(); }
     virtual IntPoint location() const OVERRIDE { return Widget::location(); }
 
     virtual Widget* parent() const OVERRIDE { return Widget::parent(); }
     virtual Widget* root() const OVERRIDE { return Widget::root(); }
 
-    void removeFromParent();
-    ScrollView* parentScrollView() const;
-
-    virtual void setFrameRect(const IntRect&) OVERRIDE;
+    virtual void setFrameRect(const IntRect& frameRect) OVERRIDE { Widget::setFrameRect(frameRect); }
     virtual IntRect frameRect() const OVERRIDE { return Widget::frameRect(); }
 
     virtual void invalidate() OVERRIDE { Widget::invalidate(); }
     virtual void invalidateRect(const IntRect&) OVERRIDE;
 
     virtual ScrollbarOverlayStyle scrollbarOverlayStyle() const OVERRIDE;
     virtual void getTickmarks(Vector<IntRect>&) const OVERRIDE;
     virtual bool isScrollableAreaActive() const OVERRIDE;
     virtual bool isScrollViewScrollbar() const OVERRIDE;
 
@@ skipping 47 matching lines @@
     void mouseMoved(const PlatformMouseEvent&);
     void mouseEntered();
     void mouseExited();
 
     // Used by some platform scrollbars to know when they've been released from capture.
     void mouseUp(const PlatformMouseEvent&);
     void mouseDown(const PlatformMouseEvent&);
 
     ScrollbarTheme* theme() const { return m_theme; }
 
-    virtual void setParent(Widget*) OVERRIDE;
-
     bool suppressInvalidation() const { return m_suppressInvalidation; }
     void setSuppressInvalidation(bool s) { m_suppressInvalidation = s; }
 
     virtual IntRect convertToContainingView(const IntRect&) const OVERRIDE;
     virtual IntRect convertFromContainingView(const IntRect&) const OVERRIDE;
 
     virtual IntPoint convertToContainingView(const IntPoint&) const OVERRIDE;
     virtual IntPoint convertFromContainingView(const IntPoint&) const OVERRIDE;
 
     void moveThumb(int pos, bool draggingDocument = false);
 
     virtual bool isAlphaLocked() const OVERRIDE { return m_isAlphaLocked; }
     virtual void setIsAlphaLocked(bool flag) OVERRIDE { m_isAlphaLocked = flag; }
 
+    bool overlapsResizer() const { return m_overlapsResizer; }
+    void setOverlapsResizer(bool overlapsResizer) { m_overlapsResizer = overlapsResizer; }
+
 protected:
     Scrollbar(ScrollableArea*, ScrollbarOrientation, ScrollbarControlSize, ScrollbarTheme* = 0);
 
     void updateThumb();
     virtual void updateThumbPosition();
     virtual void updateThumbProportion();
 
     void autoscrollTimerFired(Timer<Scrollbar>*);
     void startTimerIfNeeded(double delay);
     void stopTimerIfNeeded();
@@ skipping 31 matching lines @@
     virtual bool isScrollbar() const OVERRIDE { return true; }
 
     float scrollableAreaCurrentPos() const;
 };
 
 DEFINE_TYPE_CASTS(Scrollbar, Widget, widget, widget->isScrollbar(), widget.isScrollbar());
 
 } // namespace blink
 
 #endif // Scrollbar_h