Remove AtomicStringImpl.

Source/core/html/HTMLFormControlsCollection.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2010, 2011, 2012 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.
  *
@@ skipping 104 matching lines @@
         return item;
 
     return firstNamedItem(formControlElements(), imagesElements, nameAttr, name);
 }
 
 void HTMLFormControlsCollection::updateNameCache() const
 {
     if (hasNameCache())
         return;
 
-    HashSet<AtomicStringImpl*> foundInputElements;
+    HashSet<StringImpl*> foundInputElements;
 
     const Vector<FormAssociatedElement*>& elementsArray = formControlElements();
 
     for (unsigned i = 0; i < elementsArray.size(); ++i) {
         FormAssociatedElement* associatedElement = elementsArray[i];
         if (associatedElement->isEnumeratable()) {
             HTMLElement* element = toHTMLElement(associatedElement);
             const AtomicString& idAttrVal = element->getIdAttribute();
             const AtomicString& nameAttrVal = element->getNameAttribute();
             if (!idAttrVal.isEmpty()) {
@@ skipping 35 matching lines @@
         returnValue1Enabled = true;
         returnValue1 = namedItems.at(0);
         return;
     }
 
     returnValue0Enabled = true;
     returnValue0 = this->ownerNode()->radioNodeList(name);
 }
 
 }