Introduce toHTMLFormControlElement, and use it.

Source/core/html/HTMLSelectElement.h

 /*
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  * 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, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2010 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
@@ skipping 31 matching lines @@
 
     int selectedIndex() const;
     void setSelectedIndex(int);
 
     void optionSelectedByUser(int index, bool dispatchChangeEvent, bool allowMultipleSelection = false);
 
     // For ValidityState
     virtual String validationMessage() const OVERRIDE;
     virtual bool valueMissing() const OVERRIDE;
 
+    virtual void reset() OVERRIDE;
+
     unsigned length() const;
 
     int size() const { return m_size; }
     bool multiple() const { return m_multiple; }
 
     bool usesMenuList() const;
 
     void add(HTMLElement*, HTMLElement* beforeElement, ExceptionCode&);
     void remove(int index);
     void remove(HTMLOptionElement*);
@@ skipping 65 matching lines @@
     virtual FormControlState saveFormControlState() const OVERRIDE;
     virtual void restoreFormControlState(const FormControlState&) OVERRIDE;
 
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
     virtual bool isPresentationAttribute(const QualifiedName&) const OVERRIDE;
 
     virtual bool childShouldCreateRenderer(const NodeRenderingContext&) const OVERRIDE;
     virtual RenderObject* createRenderer(RenderArena*, RenderStyle *);
     virtual bool appendFormData(FormDataList&, bool);
 
-    virtual void reset();
-
     virtual void defaultEventHandler(Event*);
 
     void dispatchChangeEventForMenuList();
     
     void recalcListItems(bool updateSelectedStates = true) const;
 
     void deselectItems(HTMLOptionElement* excludeElement = 0);
     void typeAheadFind(KeyboardEvent*);
     void saveLastSelection();
 
@@ skipping 72 matching lines @@
 {
     ASSERT_WITH_SECURITY_IMPLICATION(!node || isHTMLSelectElement(node));
     return static_cast<const HTMLSelectElement*>(node);
 }
 
 void toHTMLSelectElement(const HTMLSelectElement*); // This overload will catch anyone doing an unnecessary cast.
 
 } // namespace
 
 #endif