Oilpan: Prepare moving ShadowRoot to oilpan.

Source/core/dom/ContainerNodeAlgorithms.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 14 matching lines @@
 
 #include "config.h"
 #include "core/dom/ContainerNodeAlgorithms.h"
 
 #include "core/dom/Element.h"
 #include "core/dom/shadow/ElementShadow.h"
 #include "core/dom/shadow/ShadowRoot.h"
 
 namespace WebCore {
 
-class ShadowRootVector : public Vector<RefPtr<ShadowRoot> > {
+class ShadowRootVector : public WillBeHeapVector<RefPtrWillBeMember<ShadowRoot> > {
 public:
     explicit ShadowRootVector(ElementShadow* tree)
     {
         for (ShadowRoot* root = tree->youngestShadowRoot(); root; root = root->olderShadowRoot())
             append(root);
     }
 };
 
 void ChildNodeInsertionNotifier::notifyDescendantInsertedIntoDocument(ContainerNode& node)
 {
@@ skipping 103 matching lines @@
     // If we overcount it's safe, but not optimal because it means we'll traverse
     // through the document in ChildFrameDisconnector looking for frames that have
     // already been disconnected.
     ASSERT(node.connectedSubframeCount() == count);
 
     return count;
 }
 #endif
 
 }