AX: Don't use listIndex in AXListBoxOption class.

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

 /*
  * Copyright (C) 2008 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 90 matching lines @@
 {
     return isHTMLOptionElement(getNode()) && toHTMLOptionElement(getNode())->selected();
 }
 
 bool AXListBoxOption::isSelectedOptionActive() const
 {
     HTMLSelectElement* listBoxParentNode = listBoxOptionParentNode();
     if (!listBoxParentNode)
         return false;
 
-    return listBoxParentNode->activeSelectionEndListIndex() == listBoxOptionIndex();
+    return listBoxParentNode->activeSelectionEnd() == getNode();
 }
 
 bool AXListBoxOption::computeAccessibilityIsIgnored(IgnoredReasons* ignoredReasons) const
 {
     if (!getNode())
         return true;
 
     if (accessibilityIsIgnoredByDefault(ignoredReasons))
         return true;
 
@@ skipping 47 matching lines @@
     if (!selectElement)
         return;
 
     if (!canSetSelectedAttribute())
         return;
 
     bool isOptionSelected = isSelected();
     if ((isOptionSelected && selected) || (!isOptionSelected && !selected))
         return;
 
-    // Convert from the entire list index to the option index.
-    int optionIndex = selectElement->listToOptionIndex(listBoxOptionIndex());
-    selectElement->accessKeySetSelectedIndex(optionIndex);
+    selectElement->selectOptionByAccessKey(toHTMLOptionElement(getNode()));
 }
 
 HTMLSelectElement* AXListBoxOption::listBoxOptionParentNode() const
 {
     if (!getNode())
         return 0;
 
     if (isHTMLOptionElement(getNode()))
         return toHTMLOptionElement(getNode())->ownerSelectElement();
 
     return 0;
 }
 
-int AXListBoxOption::listBoxOptionIndex() const
-{
-    HTMLSelectElement* selectElement = listBoxOptionParentNode();
-    if (!selectElement)
-        return -1;
-
-    const HeapVector<Member<HTMLElement>>& listItems = selectElement->listItems();
-    unsigned length = listItems.size();
-    for (unsigned i = 0; i < length; i++) {
-        if (listItems[i] == getNode())
-            return i;
-    }
-
-    return -1;
-}
-
 } // namespace blink