Oilpan: move custom element objects to the heap.

Source/core/dom/DocumentInit.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
@@ skipping 121 matching lines @@
     return *this;
 }
 
 DocumentInit& DocumentInit::withNewRegistrationContext()
 {
     ASSERT(!m_createNewRegistrationContext && !m_registrationContext);
     m_createNewRegistrationContext = true;
     return *this;
 }
 
-PassRefPtr<CustomElementRegistrationContext> DocumentInit::registrationContext(Document* document) const
+PassRefPtrWillBeRawPtr<CustomElementRegistrationContext> DocumentInit::registrationContext(Document* document) const
 {
     if (!document->isHTMLDocument() && !document->isXHTMLDocument())
         return nullptr;
 
     if (m_createNewRegistrationContext)
         return CustomElementRegistrationContext::create();
 
     return m_registrationContext.get();
 }
 
 WeakPtr<Document> DocumentInit::contextDocument() const
 {
     return m_contextDocument;
 }
 
 DocumentInit DocumentInit::fromContext(WeakPtr<Document> contextDocument, const KURL& url)
 {
     return DocumentInit(url, 0, contextDocument, 0);
 }
 
 } // namespace WebCore