AXObjectCacheImpl::postNotification shouldn't post on an ancestor.

Source/modules/accessibility/AXObjectCacheImpl.h

 /*
  * Copyright (C) 2014, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 137 matching lines @@
     bool isIDinUse(AXID id) const { return m_idsInUse.contains(id); }
 
     AXID platformGenerateAXID() const;
 
     // Counts the number of times the document has been modified. Some attribute values are cached
     // as long as the modification count hasn't changed.
     int modificationCount() const { return m_modificationCount; }
 
     void postNotification(LayoutObject*, AXNotification, bool postToElement);
     void postNotification(Node*, AXNotification, bool postToElement);
-    void postNotification(AXObject*, Document*, AXNotification, bool postToElement);
+    void postNotification(AXObject*, AXNotification, bool postToElement);
 
 protected:
     void postPlatformNotification(AXObject*, AXNotification);
     void textChanged(AXObject*);
     void labelChanged(Element*);
 
     // This is a weak reference cache for knowing if Nodes used by TextMarkers are valid.
     void setNodeInUse(Node* n) { m_textMarkerNodes.add(n); }
     void removeNodeForUse(Node* n) { m_textMarkerNodes.remove(n); }
     bool isNodeInUse(Node* n) { return m_textMarkerNodes.contains(n); }
@@ skipping 31 matching lines @@
 // This is the only subclass of AXObjectCache.
 DEFINE_TYPE_CASTS(AXObjectCacheImpl, AXObjectCache, cache, true, true);
 
 bool nodeHasRole(Node*, const String& role);
 // This will let you know if aria-hidden was explicitly set to false.
 bool isNodeAriaVisible(Node*);
 
 }
 
 #endif