Uses the activedescendant_changed event received from Blink to fire the right focus event

third_party/WebKit/Source/modules/accessibility/AXMenuListPopup.h

 /*
  * 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 26 matching lines @@
 class AXMenuListPopup final : public AXMockObject {
 public:
     static AXMenuListPopup* create(AXObjectCacheImpl& axObjectCache) { return new AXMenuListPopup(axObjectCache); }
 
     bool isEnabled() const override;
     bool isOffScreen() const override;
 
     void didUpdateActiveOption(int optionIndex);
     void didShow();
     void didHide();
-    AXObject* activeChild();
+    AXObject* activeDescendant() final;
 
 private:
     explicit AXMenuListPopup(AXObjectCacheImpl&);
 
     bool isMenuListPopup() const override { return true; }
 
     LayoutRect elementRect() const override { return LayoutRect(); }
     AccessibilityRole roleValue() const override { return MenuListPopupRole; }
 
     bool isVisible() const override;
     bool press() const override;
     void addChildren() override;
     void updateChildrenIfNecessary() override;
     bool computeAccessibilityIsIgnored(IgnoredReasons* = nullptr) const override;
 
     AXMenuListOption* menuListOptionAXObject(HTMLElement*) const;
     int getSelectedIndex() const;
 
     // Note that this may be -1 if nothing is selected.
     int m_activeIndex;
 };
 
 DEFINE_AX_OBJECT_TYPE_CASTS(AXMenuListPopup, isMenuListPopup());
 
 } // namespace blink
 
 #endif // AXMenuListPopup_h