Remove AtomicStringImpl.

Source/core/svg/properties/SVGAnimatedPropertyDescription.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
  * Copyright (C) Research In Motion Limited 2010. 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.
  *
@@ skipping 44 matching lines @@
         ASSERT(m_element);
         ASSERT(m_attributeName);
     }
 
     bool operator==(const SVGAnimatedPropertyDescription& other) const
     {
         return m_element == other.m_element && m_attributeName == other.m_attributeName;
     }
 
     SVGElement* m_element;
-    AtomicStringImpl* m_attributeName;
+    StringImpl* m_attributeName;
 };
 
 struct SVGAnimatedPropertyDescriptionHash {
     static unsigned hash(const SVGAnimatedPropertyDescription& key)
     {
         return StringHasher::hashMemory<sizeof(SVGAnimatedPropertyDescription)>(&key);
     }
 
     static bool equal(const SVGAnimatedPropertyDescription& a, const SVGAnimatedPropertyDescription& b)
     {
         return a == b;
     }
 
     static const bool safeToCompareToEmptyOrDeleted = true;
 };
 
 struct SVGAnimatedPropertyDescriptionHashTraits : WTF::SimpleClassHashTraits<SVGAnimatedPropertyDescription> { };
  
 }
 
 #endif // SVGAnimatedPropertyDescription_h