Oilpan: Prepare to move select and option elements to Oilpan heap.

Source/core/accessibility/AXRenderObject.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 858 matching lines @@
     }
 
     if (m_renderer->isText())
         return textUnderElement();
 
     if (cssBox && cssBox->isMenuList()) {
         // RenderMenuList will go straight to the text() of its selected item.
         // This has to be overridden in the case where the selected item has an ARIA label.
         HTMLSelectElement* selectElement = toHTMLSelectElement(m_renderer->node());
         int selectedIndex = selectElement->selectedIndex();
-        const Vector<HTMLElement*> listItems = selectElement->listItems();
+        const WillBeHeapVector<RawPtrWillBeMember<HTMLElement> >& listItems = selectElement->listItems();
         if (selectedIndex >= 0 && static_cast<size_t>(selectedIndex) < listItems.size()) {
             const AtomicString& overriddenDescription = listItems[selectedIndex]->fastGetAttribute(aria_labelAttr);
             if (!overriddenDescription.isNull())
                 return overriddenDescription;
         }
         return toRenderMenuList(m_renderer)->text();
     }
 
     if (m_renderer->isListMarker())
         return toRenderListMarker(m_renderer)->text();
@@ skipping 1417 matching lines @@
         if (label && label->renderer()) {
             LayoutRect labelRect = axObjectCache()->getOrCreate(label)->elementRect();
             result.unite(labelRect);
         }
     }
 
     return result;
 }
 
 } // namespace WebCore