Revert of "Implement the inert attribute"

third_party/WebKit/Source/modules/accessibility/AXMenuListOption.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 36 matching lines @@
   AXMenuListOption(HTMLOptionElement*, AXObjectCacheImpl&);
   DECLARE_VIRTUAL_TRACE();
 
   bool IsMenuListOption() const override { return true; }
 
   Node* GetNode() const override { return element_; }
   void Detach() override;
   bool IsDetached() const override { return !element_; }
   AccessibilityRole RoleValue() const override;
   bool CanHaveChildren() const override { return false; }
-  AXObjectImpl* ComputeParent() const override;
 
   Element* ActionElement() const override;
   bool IsEnabled() const override;
   bool IsVisible() const override;
   bool IsOffScreen() const override;
   bool IsSelected() const override;
   void SetSelected(bool) override;
   bool CanSetSelectedAttribute() const override;
   void GetRelativeBounds(AXObjectImpl** out_container,
                          FloatRect& out_bounds_in_container,
                          SkMatrix44& out_container_transform) const override;
   String TextAlternative(bool recursive,
                          bool in_aria_labelled_by_traversal,
                          AXObjectSet& visited,
                          AXNameFrom&,
                          AXRelatedObjectVector*,
                          NameSources*) const override;
   bool ComputeAccessibilityIsIgnored(IgnoredReasons* = nullptr) const override;
 
   Member<HTMLOptionElement> element_;
 };
 
 DEFINE_AX_OBJECT_TYPE_CASTS(AXMenuListOption, IsMenuListOption());
 
 }  // namespace blink
 
 #endif  // AXMenuListOption_h