Only allow one shadowRoot.

sky/engine/core/dom/TreeScopeAdopter.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) 2011 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 19 matching lines @@
 #include "sky/engine/core/dom/NodeTraversal.h"
 #include "sky/engine/core/dom/shadow/ElementShadow.h"
 #include "sky/engine/core/dom/shadow/ShadowRoot.h"
 
 namespace blink {
 
 void TreeScopeAdopter::moveTreeToNewScope(Node& root) const
 {
     ASSERT(needsScopeChange());
 
-#if !ENABLE(OILPAN)
     oldScope().guardRef();
-#endif
 
     Document& oldDocument = oldScope().document();
     Document& newDocument = newScope().document();
     bool willMoveToNewDocument = oldDocument != newDocument;
 
     for (Node* node = &root; node; node = NodeTraversal::next(*node, &root)) {
         updateTreeScope(*node);
 
         if (willMoveToNewDocument)
             moveNodeToNewDocument(*node, oldDocument, newDocument);
 
         if (!node->isElementNode())
             continue;
 
-        for (ShadowRoot* shadow = node->youngestShadowRoot(); shadow; shadow = shadow->olderShadowRoot()) {
+        if (ShadowRoot* shadow = node->shadowRoot()) {
             shadow->setParentTreeScope(newScope());
             if (willMoveToNewDocument)
                 moveTreeToNewDocument(*shadow, oldDocument, newDocument);
         }
     }
 
-#if !ENABLE(OILPAN)
     oldScope().guardDeref();
-#endif
 }
 
 void TreeScopeAdopter::moveTreeToNewDocument(Node& root, Document& oldDocument, Document& newDocument) const
 {
     ASSERT(oldDocument != newDocument);
     for (Node* node = &root; node; node = NodeTraversal::next(*node, &root)) {
         moveNodeToNewDocument(*node, oldDocument, newDocument);
 
-        for (ShadowRoot* shadow = node->youngestShadowRoot(); shadow; shadow = shadow->olderShadowRoot())
+        if (ShadowRoot* shadow = node->shadowRoot())
             moveTreeToNewDocument(*shadow, oldDocument, newDocument);
     }
 }
 
 #if ENABLE(ASSERT)
 static bool didMoveToNewDocumentWasCalled = false;
 static Document* oldDocumentDidMoveToNewDocumentWasCalledWith = 0;
 
 void TreeScopeAdopter::ensureDidMoveToNewDocumentWasCalled(Document& oldDocument)
 {
@@ skipping 24 matching lines @@
 #if ENABLE(ASSERT)
     didMoveToNewDocumentWasCalled = false;
     oldDocumentDidMoveToNewDocumentWasCalledWith = &oldDocument;
 #endif
 
     node.didMoveToNewDocument(oldDocument);
     ASSERT(didMoveToNewDocumentWasCalled);
 }
 
 }