Oilpan: Remove most WillBe types from the code base

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 180 matching lines @@
 
     return 0;
 }
 
 int AXListBoxOption::listBoxOptionIndex() const
 {
     HTMLSelectElement* selectElement = listBoxOptionParentNode();
     if (!selectElement)
         return -1;
 
-    const WillBeHeapVector<RawPtrWillBeMember<HTMLElement>>& listItems = selectElement->listItems();
+    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