getElementsByClassName result list no longer changes on class changes on m17 branch.

Source/WebCore/dom/StyledElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2008, 2010 Apple Inc. All rights reserved.
  *
  * 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 210 matching lines @@
     }
     bool hasClass = i < length;
     setHasClass(hasClass);
     if (hasClass) {
         attributes()->setClass(newClassString);
         if (DOMTokenList* classList = optionalClassList())
             static_cast<ClassList*>(classList)->reset(newClassString);
     } else if (attributeMap())
         attributeMap()->clearClass();
     setNeedsStyleRecalc();
+    document()->incDOMTreeVersion();
+    notifyNodeListsAttributeChanged();
 }
 
 void StyledElement::parseMappedAttribute(Attribute* attr)
 {
     if (isIdAttributeName(attr->name()))
         idAttributeChanged(attr);
     else if (attr->name() == classAttr)
         classAttributeChanged(attr->value());
     else if (attr->name() == styleAttr) {
         if (attr->isNull())
@@ skipping 201 matching lines @@
 }
 
 void StyledElement::addSubresourceAttributeURLs(ListHashSet<KURL>& urls) const
 {
     if (!m_inlineStyleDecl)
         return;
     m_inlineStyleDecl->addSubresourceStyleURLs(urls);
 }
 
 }