Introduce Node::containingTreeScope(), which asserts that the node's root is a tree scope

third_party/WebKit/Source/core/dom/Element.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003-2011, 2013, 2014 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
@@ skipping 863 matching lines @@
     return InsertionDone;
 }
 
 inline void Node::removedFrom(ContainerNode* insertionPoint)
 {
     DCHECK(insertionPoint->inShadowIncludingDocument() || isContainerNode() || isInShadowTree());
     if (insertionPoint->inShadowIncludingDocument()) {
         clearFlag(InDocumentFlag);
         insertionPoint->document().decrementNodeCount();
     }
-    if (isInShadowTree() && !treeScope().rootNode().isShadowRoot())
+    if (isInShadowTree() && !rootTreeScope().rootNode().isShadowRoot())
         clearFlag(IsInShadowTreeFlag);
     if (AXObjectCache* cache = document().existingAXObjectCache())
         cache->remove(this);
 }
 
 inline void Element::invalidateStyleAttribute()
 {
     DCHECK(elementData());
     elementData()->m_styleAttributeIsDirty = true;
 }
@@ skipping 66 matching lines @@
     static T* create(const QualifiedName&, Document&)
 #define DEFINE_ELEMENT_FACTORY_WITH_TAGNAME(T) \
     T* T::create(const QualifiedName& tagName, Document& document) \
     { \
         return new T(tagName, document); \
     }
 
 } // namespace blink
 
 #endif // Element_h