Remove Scrollbar dependency on AXObjectCache

Source/core/frame/FrameView.h

 /*
    Copyright (C) 1997 Martin Jones (mjones@kde.org)
              (C) 1998 Waldo Bastian (bastian@kde.org)
              (C) 1998, 1999 Torben Weis (weis@kde.org)
              (C) 1999 Lars Knoll (knoll@kde.org)
              (C) 1999 Antti Koivisto (koivisto@kde.org)
    Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. 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
@@ skipping 20 matching lines @@
 #include "core/rendering/PaintPhase.h"
 #include "core/rendering/PartialLayoutState.h"
 #include "platform/geometry/LayoutRect.h"
 #include "platform/graphics/Color.h"
 #include "wtf/Forward.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
+class AXObjectCache;
 class Element;
 class FloatSize;
 class Frame;
 class KURL;
 class Node;
 class OverflowEvent;
 class Page;
 class RenderBox;
 class RenderEmbeddedObject;
 class RenderObject;
@@ skipping 285 matching lines @@
     void setHasSoftwareFilters(bool hasSoftwareFilters) { m_hasSoftwareFilters = hasSoftwareFilters; }
     bool hasSoftwareFilters() const { return m_hasSoftwareFilters; }
 
     virtual bool isActive() const OVERRIDE;
 
     // DEPRECATED: Use viewportConstrainedVisibleContentRect() instead.
     IntSize scrollOffsetForFixedPosition() const;
 
     PartialLayoutState& partialLayout() { return m_partialLayout; }
 
+    // Override scrollbar notifications to update the AXObject cache.
+    virtual void didAddScrollbar(Scrollbar*, ScrollbarOrientation) OVERRIDE;
+    virtual void willRemoveScrollbar(Scrollbar*, ScrollbarOrientation) OVERRIDE;
+
     class DeferredRepaintScope {
     public:
         DeferredRepaintScope(FrameView&);
         ~DeferredRepaintScope();
     private:
         RefPtr<FrameView> m_view;
     };
 
 protected:
     virtual bool scrollContentsFastPath(const IntSize& scrollDelta, const IntRect& rectToScroll, const IntRect& clipRect);
@@ skipping 242 matching lines @@
     ASSERT(!widget || widget->isFrameView());
     return static_cast<const FrameView*>(widget);
 }
 
 // This will catch anyone doing an unnecessary cast.
 void toFrameView(const FrameView*);
 
 } // namespace WebCore
 
 #endif // FrameView_h