Remove Scrollbar dependency on AXObjectCache

Source/core/rendering/RenderLayerScrollableArea.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 752 matching lines @@
 PassRefPtr<Scrollbar> RenderLayerScrollableArea::createScrollbar(ScrollbarOrientation orientation)
 {
     RefPtr<Scrollbar> widget;
     RenderObject* actualRenderer = rendererForScrollbar(m_box);
     bool hasCustomScrollbarStyle = actualRenderer->isBox() && actualRenderer->style()->hasPseudoStyle(SCROLLBAR);
     if (hasCustomScrollbarStyle) {
         widget = RenderScrollbar::createCustomScrollbar(this, orientation, actualRenderer->node());
     } else {
         widget = Scrollbar::create(this, orientation, RegularScrollbar);
         if (orientation == HorizontalScrollbar)
-            didAddHorizontalScrollbar(widget.get());
+            didAddScrollbar(widget.get(), HorizontalScrollbar);
         else
-            didAddVerticalScrollbar(widget.get());
+            didAddScrollbar(widget.get(), VerticalScrollbar);
     }
     m_box->document().view()->addChild(widget.get());
     return widget.release();
 }
 
 void RenderLayerScrollableArea::destroyScrollbar(ScrollbarOrientation orientation)
 {
     RefPtr<Scrollbar>& scrollbar = orientation == HorizontalScrollbar ? m_hBar : m_vBar;
     if (!scrollbar)
         return;
 
-    if (!scrollbar->isCustomScrollbar()) {
-        if (orientation == HorizontalScrollbar)
-            willRemoveHorizontalScrollbar(scrollbar.get());
-        else
-            willRemoveVerticalScrollbar(scrollbar.get());
-    }
+    if (!scrollbar->isCustomScrollbar())
+        willRemoveScrollbar(scrollbar.get(), orientation);
 
     scrollbar->removeFromParent();
     scrollbar->disconnectFromScrollableArea();
     scrollbar = 0;
 }
 
 void RenderLayerScrollableArea::setHasHorizontalScrollbar(bool hasScrollbar)
 {
     if (hasScrollbar == hasHorizontalScrollbar())
         return;
@@ skipping 666 matching lines @@
 void RenderLayerScrollableArea::setForceNeedsCompositedScrolling(ForceNeedsCompositedScrollingMode mode)
 {
     if (m_forceNeedsCompositedScrolling == mode)
         return;
 
     m_forceNeedsCompositedScrolling = mode;
     layer()->didUpdateNeedsCompositedScrolling();
 }
 
 } // Namespace WebCore