Remove Scrollbar dependency on AXObjectCache

Source/core/frame/FrameView.h

Index: Source/core/frame/FrameView.h
diff --git a/Source/core/frame/FrameView.h b/Source/core/frame/FrameView.h
index d75aecc4a137960f91317eebf5dc29a33ce88a06..273359b97403224cd5b25a47f3cbc8737fbc013c 100644
--- a/Source/core/frame/FrameView.h
+++ b/Source/core/frame/FrameView.h
@@ -38,6 +38,7 @@
 
 namespace WebCore {
 
+class AXObjectCache;
 class Element;
 class FloatSize;
 class Frame;
@@ -343,6 +344,10 @@ public:
 
     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&);