Oilpan: make DocumentFragment a heap allocated object.

Source/core/dom/Document.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, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 849 matching lines @@
 }
 
 LocalFrame* Document::executingFrame()
 {
     DOMWindow* window = executingWindow();
     if (!window)
         return 0;
     return window->frame();
 }
 
-PassRefPtr<DocumentFragment> Document::createDocumentFragment()
+PassRefPtrWillBeRawPtr<DocumentFragment> Document::createDocumentFragment()
 {
     return DocumentFragment::create(*this);
 }
 
 PassRefPtrWillBeRawPtr<Text> Document::createTextNode(const String& data)
 {
     return Text::create(*this, data);
 }
 
 PassRefPtrWillBeRawPtr<Comment> Document::createComment(const String& data)
@@ skipping 97 matching lines @@
     case ATTRIBUTE_NODE:
         return Attr::create(*this, QualifiedName(nullAtom, AtomicString(toAttr(importedNode)->name()), nullAtom), toAttr(importedNode)->value());
     case DOCUMENT_FRAGMENT_NODE: {
         if (importedNode->isShadowRoot()) {
             // ShadowRoot nodes should not be explicitly importable.
             // Either they are imported along with their host node, or created implicitly.
             exceptionState.throwDOMException(NotSupportedError, "The node provided is a shadow root, which may not be imported.");
             return nullptr;
         }
         DocumentFragment* oldFragment = toDocumentFragment(importedNode);
-        RefPtr<DocumentFragment> newFragment = createDocumentFragment();
+        RefPtrWillBeRawPtr<DocumentFragment> newFragment = createDocumentFragment();
         if (deep && !importContainerNodeChildren(oldFragment, newFragment, exceptionState))
             return nullptr;
 
         return newFragment.release();
     }
     case DOCUMENT_NODE:
         exceptionState.throwDOMException(NotSupportedError, "The node provided is a document, which may not be imported.");
         return nullptr;
     }
 
@@ skipping 4732 matching lines @@
     visitor->trace(m_transitionTimeline);
     visitor->trace(m_compositorPendingAnimations);
     visitor->registerWeakMembers<Document, &Document::clearWeakMembers>(this);
     DocumentSupplementable::trace(visitor);
     TreeScope::trace(visitor);
     ContainerNode::trace(visitor);
     ExecutionContext::trace(visitor);
 }
 
 } // namespace WebCore