[oilpan] Make the oilpan branch build on Mac.

Source/core/accessibility/AccessibilityListBoxOption.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 24 matching lines @@
 #include "core/html/HTMLSelectElement.h"
 #include "core/rendering/RenderListBox.h"
 
 using namespace std;
 
 namespace WebCore {
 
 using namespace HTMLNames;
     
 AccessibilityListBoxOption::AccessibilityListBoxOption()
-    : m_optionElement(0)
 {
 }
 
 AccessibilityListBoxOption::~AccessibilityListBoxOption()
 {
 }    
     
 PassRefPtr<AccessibilityListBoxOption> AccessibilityListBoxOption::create()
 {
     return adoptRef(new AccessibilityListBoxOption());
@@ skipping 163 matching lines @@
     const Vector<Member<HTMLElement> >& listItems = selectElement->listItems();
     unsigned length = listItems.size();
     for (unsigned i = 0; i < length; i++)
         if (listItems[i] == m_optionElement)
             return i;
 
     return -1;
 }
 
 } // namespace WebCore