Re-land: Don't keep recreating AXMenuListPopup

Source/modules/accessibility/AXMenuList.cpp

 /*
  * Copyright (C) 2010 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 75 matching lines @@
     if (list->accessibilityIsIgnored()) {
         cache->remove(list->axObjectID());
         return;
     }
 
     m_children.append(list);
 
     list->addChildren();
 }
 
-void AXMenuList::childrenChanged()
-{
-    if (m_children.isEmpty())
-        return;
-
-    ASSERT(m_children.size() == 1);
-    m_children[0]->childrenChanged();
-}
-
 bool AXMenuList::isCollapsed() const
 {
     return !toLayoutMenuList(m_layoutObject)->popupIsVisible();
 }
 
 AccessibilityExpanded AXMenuList::isExpanded() const
 {
     if (isCollapsed())
         return ExpandedCollapsed;
 
@@ skipping 39 matching lines @@
         return;
 
     AXMenuListPopup* popup = toAXMenuListPopup(children()[0].get());
     popup->didHide();
 
     if (node() && node()->focused())
         axObjectCache()->postNotification(this, AXObjectCacheImpl::AXFocusedUIElementChanged);
 }
 
 } // namespace blink