Storage of ComputedStyle separate from LayoutObject.

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 246 matching lines @@
 #endif
     InstanceCounters::incrementCounter(InstanceCounters::NodeCounter);
 }
 
 Node::~Node()
 {
     // With Oilpan, the rare data finalizer also asserts for
     // this condition (we cannot directly access it here.)
     RELEASE_ASSERT(hasRareData() || !layoutObject());
     InstanceCounters::decrementCounter(InstanceCounters::NodeCounter);
+    if (!hasRareData() && !hasLayoutObject() && m_data.m_computedStyle)

[esprehn, 2016/08/05 21:26:26]

!hasLayoutObject() doesn't make sense here, you can't have a LayoutObject when
~Node runs, you'd fail the RELEASE_ASSERT above and crash

[Bugs Nash, 2016/08/12 03:55:33]

Done

+        m_data.m_computedStyle->deref();
 }
 
 NodeRareData* Node::rareData() const
 {
     ASSERT_WITH_SECURITY_IMPLICATION(hasRareData());
     return static_cast<NodeRareData*>(m_data.m_rareData);
 }
 
 NodeRareData& Node::ensureRareData()
 {
     if (hasRareData())
         return *rareData();
 
     if (isElementNode())
-        m_data.m_rareData = ElementRareData::create(m_data.m_layoutObject);
+        m_data.m_rareData = ElementRareData::create(layoutObject());
     else
-        m_data.m_rareData = NodeRareData::create(m_data.m_layoutObject);
+        m_data.m_rareData = NodeRareData::create(layoutObject());
 
     DCHECK(m_data.m_rareData);
 
     setFlag(HasRareDataFlag);
     return *rareData();
 }
 
 Node* Node::toNode()
 {
     return this;
@@ skipping 2209 matching lines @@
 
 void showNodePath(const blink::Node* node)
 {
     if (node)
         node->showNodePathForThis();
     else
         fprintf(stderr, "Cannot showNodePath for (nil)\n");
 }
 
 #endif