Remove Scrollbar dependency on AXObjectCache

Source/core/rendering/RenderListBox.cpp

Index: Source/core/rendering/RenderListBox.cpp
diff --git a/Source/core/rendering/RenderListBox.cpp b/Source/core/rendering/RenderListBox.cpp
index 4b7d575d2cbdd4f9b855aa7a4a96e1317a051529..9b4107844ac12fc80b8efc0ab99d30abfe6358a9 100644
--- a/Source/core/rendering/RenderListBox.cpp
+++ b/Source/core/rendering/RenderListBox.cpp
@@ -895,7 +895,7 @@ PassRefPtr<Scrollbar> RenderListBox::createScrollbar()
         widget = RenderScrollbar::createCustomScrollbar(this, VerticalScrollbar, this->node());
     else {
         widget = Scrollbar::create(this, VerticalScrollbar, RenderTheme::theme().scrollbarControlSizeForPart(ListboxPart));
-        didAddVerticalScrollbar(widget.get());
+        didAddScrollbar(widget.get(), VerticalScrollbar);
     }
     document().view()->addChild(widget.get());
     return widget.release();
@@ -907,7 +907,7 @@ void RenderListBox::destroyScrollbar()
         return;
 
     if (!m_vBar->isCustomScrollbar())
-        ScrollableArea::willRemoveVerticalScrollbar(m_vBar.get());
+        ScrollableArea::willRemoveScrollbar(m_vBar.get(), VerticalScrollbar);
     m_vBar->removeFromParent();
     m_vBar->disconnectFromScrollableArea();
     m_vBar = 0;