Remove Scrollbar dependency on AXObjectCache

Source/core/frame/FrameView.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 3480 matching lines @@
 
 void FrameView::setLayoutSizeInternal(const IntSize& size)
 {
     if (m_layoutSize == size)
         return;
 
     m_layoutSize = size;
     contentsResized();
 }
 
+void FrameView::didAddScrollbar(Scrollbar* scrollbar, ScrollbarOrientation orientation)
+{
+    ScrollableArea::didAddScrollbar(scrollbar, orientation);
+    if (AXObjectCache* cache = axObjectCache())
+        cache->handleScrollbarUpdate(this);
+}
+
+void FrameView::willRemoveScrollbar(Scrollbar* scrollbar, ScrollbarOrientation orientation)
+{
+    ScrollableArea::willRemoveScrollbar(scrollbar, orientation);
+    if (AXObjectCache* cache = axObjectCache()) {
+        cache->remove(scrollbar);
+        cache->handleScrollbarUpdate(this);
+    }
+}
+
 } // namespace WebCore