Let HTMLTablePartElement::findParentTable() about come across shadow boundary.

Source/core/html/HTMLTablePartElement.cpp

 /**
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006 Apple Computer, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 13 matching lines @@
 
 #include "config.h"
 #include "core/html/HTMLTablePartElement.h"
 
 #include "CSSPropertyNames.h"
 #include "CSSValueKeywords.h"
 #include "HTMLNames.h"
 #include "core/css/CSSImageValue.h"
 #include "core/css/StylePropertySet.h"
 #include "core/dom/Document.h"
+#include "core/dom/NodeRenderingTraversal.h"
 #include "core/html/HTMLTableElement.h"
 #include "core/html/parser/HTMLParserIdioms.h"
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
 bool HTMLTablePartElement::isPresentationAttribute(const QualifiedName& name) const
 {
     if (name == bgcolorAttr || name == backgroundAttr || name == valignAttr || name == alignAttr || name == heightAttr)
@@ skipping 33 matching lines @@
             addPropertyToPresentationAttributeStyle(style, CSSPropertyTextAlign, value);
     } else if (name == heightAttr) {
         if (!value.isEmpty())
             addHTMLLengthToStyle(style, CSSPropertyHeight, value);
     } else
         HTMLElement::collectStyleForPresentationAttribute(name, value, style);
 }
 
 HTMLTableElement* HTMLTablePartElement::findParentTable() const
 {
-    ContainerNode* parent = parentNode();
+    ContainerNode* parent = NodeRenderingTraversal::parent(this);
     while (parent && !parent->hasTagName(tableTag))
-        parent = parent->parentNode();
+        parent = NodeRenderingTraversal::parent(parent);
     return static_cast<HTMLTableElement*>(parent);
 }
 
 }