Introduce toHTMLFormControlElement, and use it.

Source/core/html/HTMLFormElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 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 98 matching lines @@
         AutocompleteResultErrorCancel,
         AutocompleteResultErrorInvalid,
     };
 
     void requestAutocomplete();
     void finishRequestAutocomplete(AutocompleteResult);
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(autocomplete);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(autocompleteerror);
 
-    HTMLFormControlElement* elementForAlias(const AtomicString&);
-    void addElementAlias(HTMLFormControlElement*, const AtomicString& alias);
+    Node* elementForAlias(const AtomicString&);
+    void addElementAlias(Node*, const AtomicString& alias);
 
     CheckedRadioButtons& checkedRadioButtons() { return m_checkedRadioButtons; }
 
     const Vector<FormAssociatedElement*>& associatedElements() const { return m_associatedElements; }
     const Vector<HTMLImageElement*>& imageElements() const { return m_imageElements; }
 
     void getTextFieldValues(StringPairVector& fieldNamesAndValues) const;
     void anonymousNamedGetter(const AtomicString& name, bool&, RefPtr<NodeList>&, bool&, RefPtr<Node>&);
 
 private:
@@ skipping 19 matching lines @@
     unsigned formElementIndex(FormAssociatedElement*);
 
     // Returns true if the submission should proceed.
     bool validateInteractively(Event*);
 
     // Validates each of the controls, and stores controls of which 'invalid'
     // event was not canceled to the specified vector. Returns true if there
     // are any invalid controls in this form.
     bool checkInvalidControlsAndCollectUnhandled(Vector<RefPtr<FormAssociatedElement> >*, HTMLFormControlElement::CheckValidityDispatchEvents = HTMLFormControlElement::CheckValidityDispatchEventsAllowed);
 
-    typedef HashMap<RefPtr<AtomicStringImpl>, RefPtr<HTMLFormControlElement> > AliasMap;
+    typedef HashMap<RefPtr<AtomicStringImpl>, RefPtr<Node> > AliasMap;
 
     FormSubmission::Attributes m_attributes;
     OwnPtr<AliasMap> m_elementAliases;
 
     CheckedRadioButtons m_checkedRadioButtons;
 
     unsigned m_associatedElementsBeforeIndex;
     unsigned m_associatedElementsAfterIndex;
     Vector<FormAssociatedElement*> m_associatedElements;
     Vector<HTMLImageElement*> m_imageElements;
 
     bool m_wasUserSubmitted;
     bool m_isSubmittingOrPreparingForSubmission;
     bool m_shouldSubmit;
 
     bool m_isInResetFunction;
 
     bool m_wasDemoted;
 
     void requestAutocompleteTimerFired(Timer<HTMLFormElement>*);
 
     Vector<RefPtr<Event> > m_pendingAutocompleteEvents;
     Timer<HTMLFormElement> m_requestAutocompleteTimer;
 };
 
 } // namespace WebCore
 
 #endif // HTMLFormElement_h