Keep track of accessibility focus across windows.

third_party/WebKit/Source/modules/accessibility/AXObject.cpp

 /*
  * Copyright (C) 2008, 2009, 2011 Apple 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 1164 matching lines @@
 void AXObject::clearChildren()
 {
     // Detach all weak pointers from objects to their parents.
     for (const auto& child : m_children)
         child->detachFromParent();
 
     m_children.clear();
     m_haveChildren = false;
 }
 
-AXObject* AXObject::focusedUIElement() const
-{
-    Document* doc = document();
-    if (!doc)
-        return 0;
-
-    Page* page = doc->page();
-    if (!page)
-        return 0;
-
-    return axObjectCache().focusedUIElementForPage(page);
-}
-
 Document* AXObject::document() const
 {
     FrameView* frameView = documentFrameView();
     if (!frameView)
         return 0;
 
     return frameView->frame().document();
 }
 
 FrameView* AXObject::documentFrameView() const
@@ skipping 493 matching lines @@
 
 DEFINE_TRACE(AXObject)
 {
     visitor->trace(m_children);
     visitor->trace(m_parent);
     visitor->trace(m_cachedLiveRegionRoot);
     visitor->trace(m_axObjectCache);
 }
 
 } // namespace blink