AX: Don't use listIndex in AXListBoxOption class.

third_party/WebKit/Source/core/html/HTMLSelectElement.h

 /*
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 84 matching lines @@
 
     void optionElementChildrenChanged(const HTMLOptionElement&);
 
     void invalidateSelectedItems();
 
     using ListItems = HeapVector<Member<HTMLElement>>;
     // We prefer |optionList()| to |listItems()|.
     const ListItems& listItems() const;
 
     void accessKeyAction(bool sendMouseEvents) override;
-    void accessKeySetSelectedIndex(int);
+    void selectOptionByAccessKey(HTMLOptionElement*);
 
     void setOption(unsigned index, HTMLOptionElement*, ExceptionState&);
 
     Element* namedItem(const AtomicString& name);
     HTMLOptionElement* item(unsigned index);
 
     void scrollToSelection();
     void scrollToOption(HTMLOptionElement*);
 
     bool canSelectAll() const;
     void selectAll();
-    int listToOptionIndex(int listIndex) const;
     void listBoxOnChange();
     int optionToListIndex(int optionIndex) const;
     int activeSelectionEndListIndex() const;
     HTMLOptionElement* activeSelectionEnd() const;
     void setActiveSelectionAnchor(HTMLOptionElement*);
     void setActiveSelectionEnd(HTMLOptionElement*);
 
     // For use in the implementation of HTMLOptionElement.
     void optionSelectionStateChanged(HTMLOptionElement*, bool optionIsSelected);
     void optionInserted(HTMLOptionElement&, bool optionIsSelected);
@@ skipping 166 matching lines @@
 
     FRIEND_TEST_ALL_PREFIXES(HTMLSelectElementTest, FirstSelectableOption);
     FRIEND_TEST_ALL_PREFIXES(HTMLSelectElementTest, LastSelectableOption);
     FRIEND_TEST_ALL_PREFIXES(HTMLSelectElementTest, NextSelectableOption);
     FRIEND_TEST_ALL_PREFIXES(HTMLSelectElementTest, PreviousSelectableOption);
 };
 
 } // namespace blink
 
 #endif // HTMLSelectElement_h