Revert 146726 "AXObjectCache gets recreated during document tear..."

Source/WebCore/platform/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 156 matching lines @@
     void updateThumb();
     virtual void updateThumbPosition();
     virtual void updateThumbProportion();
 
     void autoscrollTimerFired(Timer<Scrollbar>*);
     void startTimerIfNeeded(double delay);
     void stopTimerIfNeeded();
     void autoscrollPressedPart(double delay);
     ScrollDirection pressedPartScrollDirection();
     ScrollGranularity pressedPartScrollGranularity();
-
+    
     ScrollableArea* m_scrollableArea;
     ScrollbarOrientation m_orientation;
     ScrollbarControlSize m_controlSize;
     ScrollbarTheme* m_theme;
 
     int m_visibleSize;
     int m_totalSize;
     float m_currentPos;
     float m_dragOrigin;
     int m_lineStep;
@@ skipping 11 matching lines @@
 
     Timer<Scrollbar> m_scrollTimer;
     bool m_overlapsResizer;
 
     bool m_suppressInvalidation;
 
     bool m_isAlphaLocked;
 
 private:
     virtual bool isScrollbar() const { return true; }
-    virtual AXObjectCache* existingAXObjectCache() const;
+    virtual AXObjectCache* axObjectCache() const;
 };
 
 } // namespace WebCore
 
 #endif // Scrollbar_h