Revert of [wrapper-tracing] Another write barrier Node EventTargetData

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 1868 matching lines @@
   return hasEventTargetData() ? eventTargetDataMap().get(this) : nullptr;
 }
 
 EventTargetData& Node::ensureEventTargetData() {
   if (hasEventTargetData())
     return *eventTargetDataMap().get(this);
   DCHECK(!eventTargetDataMap().contains(this));
   setHasEventTargetData(true);
   EventTargetData* data = new EventTargetData;
   eventTargetDataMap().set(this, data);
-  ScriptWrappableVisitor::writeBarrier(this, data);
   return *data;
 }
 
 HeapVector<TraceWrapperMember<MutationObserverRegistration>>*
 Node::mutationObserverRegistry() {
   if (!hasRareData())
     return nullptr;
   NodeMutationObserverData* data = rareData()->mutationObserverData();
   if (!data)
     return nullptr;
@@ skipping 569 matching lines @@
   if (node) {
     std::stringstream stream;
     node->printNodePathTo(stream);
     LOG(INFO) << stream.str();
   } else {
     LOG(INFO) << "Cannot showNodePath for <null>";
   }
 }
 
 #endif