Remove TreatNullAs=NullString for HTMLObjectElement

Source/core/html/HTMLObjectElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Stefan Schimanski (1Stein@gmx.de)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 326 matching lines @@
     updateDocNamedItem();
     if (inDocument() && !useFallbackContent()) {
         setNeedsWidgetUpdate(true);
         setNeedsStyleRecalc();
     }
     HTMLPlugInElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);
 }
 
 bool HTMLObjectElement::isURLAttribute(const Attribute& attribute) const
 {
-    return attribute.name() == dataAttr || (attribute.name() == usemapAttr && attribute.value().string()[0] != '#') || HTMLPlugInElement::isURLAttribute(attribute);
+    return attribute.name() == codebaseAttr || attribute.name() == dataAttr
+        || (attribute.name() == usemapAttr && attribute.value().string()[0] != '#')
+        || HTMLPlugInElement::isURLAttribute(attribute);
 }
 
 const AtomicString HTMLObjectElement::imageSourceURL() const
 {
     return getAttribute(dataAttr);
 }
 
 // FIXME: Remove this hack.
 void HTMLObjectElement::reattachFallbackContent()
 {
@@ skipping 147 matching lines @@
 {
     return FormAssociatedElement::form();
 }
 
 bool HTMLObjectElement::isInteractiveContent() const
 {
     return fastHasAttribute(usemapAttr);
 }
 
 }