Replace nextSiblingChildren() with simpler nextSibling() when equivalent

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 422 matching lines @@
             return false;
     }
     return true;
 }
 
 bool HTMLObjectElement::containsJavaApplet() const
 {
     if (MIMETypeRegistry::isJavaAppletMIMEType(getAttribute(typeAttr)))
         return true;
 
-    for (HTMLElement* child = Traversal<HTMLElement>::firstWithin(*this); child; child = Traversal<HTMLElement>::nextSkippingChildren(*child, this)) {
+    for (HTMLElement* child = Traversal<HTMLElement>::firstChild(*this); child; child = Traversal<HTMLElement>::nextSibling(*child)) {
         if (isHTMLParamElement(*child)
                 && equalIgnoringCase(child->getNameAttribute(), "type")
                 && MIMETypeRegistry::isJavaAppletMIMEType(child->getAttribute(valueAttr).string()))
             return true;
         if (isHTMLObjectElement(*child) && toHTMLObjectElement(*child).containsJavaApplet())
             return true;
         if (isHTMLAppletElement(*child))
             return true;
     }
 
@@ skipping 30 matching lines @@
 {
     return fastHasAttribute(usemapAttr);
 }
 
 bool HTMLObjectElement::useFallbackContent() const
 {
     return HTMLPlugInElement::useFallbackContent() || m_useFallbackContent;
 }
 
 }