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

third_party/WebKit/Source/core/dom/Node.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/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 356 matching lines @@
             last = currentElement->pseudoElement(PseudoIdBefore);
         return last;
     }
 
     return lastChild();
 }
 
 Node& Node::treeRoot() const
 {
     if (isInTreeScope())
-        return treeScope().rootNode();
+        return containingTreeScope().rootNode();
     const Node* node = this;
     while (node->parentNode())
         node = node->parentNode();
     return const_cast<Node&>(*node);
 }
 
 Node* Node::insertBefore(Node* newChild, Node* refChild, ExceptionState& exceptionState)
 {
     if (isContainerNode())
         return toContainerNode(this)->insertBefore(newChild, refChild, exceptionState);
@@ skipping 2109 matching lines @@
 
 void showNodePath(const blink::Node* node)
 {
     if (node)
         node->showNodePathForThis();
     else
         fprintf(stderr, "Cannot showNodePath for (nil)\n");
 }
 
 #endif