Forbid entering recalcStyle or attach from inside detach.

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 904 matching lines @@
 
     // We only need to detach if the node has already been through attach().
     if (styleChangeType() < NeedsReattachStyleChange)
         detach(reattachContext);
     attach(reattachContext);
 }
 
 void Node::attach(const AttachContext&)
 {
     ASSERT(document().inStyleRecalc() || isDocumentNode());
+    ASSERT(!document().lifecycle().inDetach());
     ASSERT(needsAttach());
     ASSERT(!layoutObject() || (layoutObject()->style() && (layoutObject()->parent() || layoutObject()->isLayoutView())));
 
     clearNeedsStyleRecalc();
 
     if (AXObjectCache* cache = document().axObjectCache())
         cache->updateCacheAfterNodeIsAttached(this);
 }
 
 void Node::detach(const AttachContext& context)
@@ skipping 1531 matching lines @@
 
 void showNodePath(const blink::Node* node)
 {
     if (node)
         node->showNodePathForThis();
     else
         fprintf(stderr, "Cannot showNodePath for (nil)\n");
 }
 
 #endif