Enable Oilpan for core/xml/

Source/core/xml/XSLStyleSheet.h

 /*
  * This file is part of the XSL implementation.
  *
  * Copyright (C) 2004, 2006, 2008, 2012 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 93 matching lines @@
 private:
     XSLStyleSheet(Node* parentNode, const String& originalURL, const KURL& finalURL, bool embedded);
     XSLStyleSheet(Document* ownerDocument, Node* styleSheetRootNode, const String& originalURL, const KURL& finalURL, bool embedded);
     XSLStyleSheet(XSLImportRule* parentImport, const String& originalURL, const KURL& finalURL);
 
     RawPtrWillBeMember<Node> m_ownerNode;
     String m_originalURL;
     KURL m_finalURL;
     bool m_isDisabled;
 
-    WillBeHeapVector<OwnPtrWillBeMember<XSLImportRule> > m_children;
+    PersistentHeapVectorWillBeHeapVector<Member<XSLImportRule> > m_children;
 
     bool m_embedded;
     bool m_processed;
 
     xmlDocPtr m_stylesheetDoc;
     bool m_stylesheetDocTaken;
     bool m_compilationFailed;
 
     RawPtrWillBeMember<XSLStyleSheet> m_parentStyleSheet;
     RefPtrWillBeMember<Document> m_ownerDocument;
 };
 
 DEFINE_TYPE_CASTS(XSLStyleSheet, StyleSheet, sheet, !sheet->isCSSStyleSheet(), !sheet.isCSSStyleSheet());
 
 } // namespace blink
 
 #endif // XSLStyleSheet_h