Oilpan: move SVG property hierarchy to the heap.

Source/core/svg/SVGStringList.idl

 /*
  * Copyright (C) 2006 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
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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 [
     TypeChecking=Interface,
     SetWrapperReferenceTo(SVGElement contextElement),
     ImplementedAs=SVGStringListTearOff,
-    RuntimeEnabled=SVG1DOM
+    RuntimeEnabled=SVG1DOM,
+    WillBeGarbageCollected,
 ] interface SVGStringList {
     readonly attribute unsigned long length;
     [ImplementedAs=length] readonly attribute unsigned long numberOfItems;
 
     [RaisesException] void clear();
     [RaisesException] DOMString initialize(DOMString item);
     [RaisesException] getter DOMString getItem(unsigned long index);
     [RaisesException] setter DOMString (unsigned long index, DOMString value);
     [RaisesException] DOMString insertItemBefore(DOMString item, unsigned long index);
     [RaisesException] DOMString replaceItem(DOMString item, unsigned long index);
     [RaisesException] DOMString removeItem(unsigned long index);
     [RaisesException] DOMString appendItem(DOMString item);
 };