Make AX update layout on all frames

Source/core/accessibility/AXObject.h

Index: Source/core/accessibility/AXObject.h
diff --git a/Source/core/accessibility/AXObject.h b/Source/core/accessibility/AXObject.h
index b4f3f78f159ad697720ab1723230e7215dd4a625..b10d5db83079a46f21ab49a69cf379146f1bac85 100644
--- a/Source/core/accessibility/AXObject.h
+++ b/Source/core/accessibility/AXObject.h
@@ -293,9 +293,6 @@ public:
     AXObjectCache* axObjectCache() const;
     AXID axObjectID() const { return m_id; }
 
-    // Lays out the page so that the accessibility tree is based on up-to-date information.
-    void updateBackingStore();
-
     // Determine subclass type.
     virtual bool isAXNodeObject() const { return false; }
     virtual bool isAXRenderObject() const { return false; }