WebKit merge 41660:41709 (WebKit side)....

third_party/WebKit/WebCore/dom/QualifiedName.h

 /*
  * Copyright (C) 2005, 2006, 2009 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
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 31 matching lines @@
         }
 
         AtomicString m_prefix;
         AtomicString m_localName;
         AtomicString m_namespace;
 
     private:
         QualifiedNameImpl(const AtomicString& prefix, const AtomicString& localName, const AtomicString& namespaceURI)
             : m_prefix(prefix)
             , m_localName(localName)
-            , m_namespace(namespaceURI)
+            , m_namespace(namespaceURI.isEmpty() ? nullAtom : namespaceURI)
         {
         }        
     };
 
     QualifiedName(const AtomicString& prefix, const AtomicString& localName, const AtomicString& namespaceURI);
     ~QualifiedName() { deref(); }
 #ifdef QNAME_DEFAULT_CONSTRUCTOR
     QualifiedName() : m_impl(0) { }
 #endif
 
@@ skipping 96 matching lines @@
     
     template<> struct HashTraits<WebCore::QualifiedName> : GenericHashTraits<WebCore::QualifiedName> {
         static const bool emptyValueIsZero = false;
         static WebCore::QualifiedName emptyValue() { return WebCore::QualifiedName(WebCore::nullAtom, WebCore::nullAtom, WebCore::nullAtom); }
         static void constructDeletedValue(WebCore::QualifiedName& slot) { new (&slot) WebCore::QualifiedName(WebCore::nullAtom, WebCore::AtomicString(HashTableDeletedValue), WebCore::nullAtom); }
         static bool isDeletedValue(const WebCore::QualifiedName& slot) { return slot.localName().isHashTableDeletedValue(); }
     };
 }
 
 #endif