Oilpan: move DOM string collection objects to the Oilpan heap.

Source/core/frame/Location.h

 /*
  * Copyright (C) 2008, 2010 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 55 matching lines @@
     void setPort(DOMWindow* callingWindow, DOMWindow* enteredWindow, const String&);
     String port() const;
     void setPathname(DOMWindow* callingWindow, DOMWindow* enteredWindow, const String&);
     String pathname() const;
     void setSearch(DOMWindow* callingWindow, DOMWindow* enteredWindow, const String&);
     String search() const;
     void setHash(DOMWindow* callingWindow, DOMWindow* enteredWindow, const String&);
     String hash() const;
     String origin() const;
 
-    PassRefPtr<DOMStringList> ancestorOrigins() const;
+    PassRefPtrWillBeRawPtr<DOMStringList> ancestorOrigins() const;
 
     void trace(Visitor*) { }
 
 private:
     explicit Location(LocalFrame*);
 
     void setLocation(const String&, DOMWindow* callingWindow, DOMWindow* enteredWindow);
 
     const KURL& url() const;
 };
 
 } // namespace WebCore
 
 #endif // Location_h