Do not use outdated m_distributedNodes of slots in non-shadow trees

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/)
  *
@@ skipping 2356 matching lines @@
     // Relevant DOM Standard:
     // https://dom.spec.whatwg.org/#concept-node-insert
     // - 6.1.3: If parent is a slot whose assigned nodes is the empty list, then
     //   run signal a slot change for parent.
     // https://dom.spec.whatwg.org/#concept-node-remove
     // - 11. If parent is a slot whose assigned nodes is the empty list, then
     //   run signal a slot change for parent.
     Element* parent = parentElement();
     if (parent && isHTMLSlotElement(parent)) {
       HTMLSlotElement& parentSlot = toHTMLSlotElement(*parent);
+      // TODO(hayato): Support slotchange for slots in non-shadow trees.
       if (ShadowRoot* root = containingShadowRoot()) {
         if (root && root->isV1() && !parentSlot.hasAssignedNodesSlow())
           parentSlot.enqueueSlotChangeEvent();
       }
     }
   }
 }
 
 DEFINE_TRACE(Node) {
   visitor->trace(m_parentOrShadowHostNode);
@@ skipping 81 matching lines @@
   if (node) {
     std::stringstream stream;
     node->printNodePathTo(stream);
     LOG(INFO) << stream.str();
   } else {
     LOG(INFO) << "Cannot showNodePath for <null>";
   }
 }
 
 #endif