Get rid of useless calls to AtomicString::impl()

Source/core/html/forms/FormController.cpp

 /*
  * Copyright (C) 2006, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010, 2011, 2012 Google 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,
@@ skipping 442 matching lines @@
     if (stateVector.size() < 1 || stateVector[i++] != formStateSignature())
         return;
 
     while (i + 1 < stateVector.size()) {
         AtomicString formKey = stateVector[i++];
         OwnPtr<SavedFormState> state = SavedFormState::deserialize(stateVector, i);
         if (!state) {
             i = 0;
             break;
         }
-        map.add(formKey.impl(), state.release());
+        map.add(formKey, state.release());
     }
     if (i != stateVector.size())
         map.clear();
 }
 
 void FormController::willDeleteForm(HTMLFormElement* form)
 {
     if (m_formKeyGenerator)
         m_formKeyGenerator->willDeleteForm(form);
 }
@@ skipping 45 matching lines @@
     m_formElementsWithState.add(control);
 }
 
 void FormController::unregisterFormElementWithState(HTMLFormControlElementWithState* control)
 {
     RELEASE_ASSERT(m_formElementsWithState.contains(control));
     m_formElementsWithState.remove(control);
 }
 
 } // namespace WebCore