Remove AtomicStringImpl.

Source/core/dom/CheckedRadioButtons.h

 /*
  * Copyright (C) 2007, 2008, 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
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef CheckedRadioButtons_h
 #define CheckedRadioButtons_h
 
 #include "wtf/Forward.h"
 #include "wtf/HashMap.h"
 #include "wtf/OwnPtr.h"
+#include "wtf/text/StringHash.h"
 
 namespace WebCore {
 
 class HTMLInputElement;
 class RadioButtonGroup;
 
 // FIXME: Rename the class. The class was a simple map from a name to a checked
 // radio button. It manages RadioButtonGroup objects now.
 class CheckedRadioButtons {
 public:
     CheckedRadioButtons();
     ~CheckedRadioButtons();
     void addButton(HTMLInputElement*);
     void updateCheckedState(HTMLInputElement*);
     void requiredAttributeChanged(HTMLInputElement*);
     void removeButton(HTMLInputElement*);
     HTMLInputElement* checkedButtonForGroup(const AtomicString& groupName) const;
     bool isInRequiredGroup(HTMLInputElement*) const;
 
 private:
-    typedef HashMap<AtomicStringImpl*, OwnPtr<RadioButtonGroup> > NameToGroupMap;
+    typedef HashMap<StringImpl*, OwnPtr<RadioButtonGroup> > NameToGroupMap;
     OwnPtr<NameToGroupMap> m_nameToGroupMap;
 };
 
 } // namespace WebCore
 
 #endif // CheckedRadioButtons_h