Introduce toHTMLFormControlElement, and use it.

Source/WebKit/chromium/src/WebFormElement.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 76 matching lines @@
 void WebFormElement::getFormControlElements(WebVector<WebFormControlElement>& result) const
 {
     const HTMLFormElement* form = constUnwrap<HTMLFormElement>();
     Vector<RefPtr<HTMLFormControlElement> > tempVector;
     // FIXME: We should move the for-loop condition into a variable instead of
     // re-evaluating size each time. Also, consider refactoring this code so that
     // we don't call form->associatedElements() multiple times.
     for (size_t i = 0; i < form->associatedElements().size(); i++) {
         if (!form->associatedElements()[i]->isFormControlElement())
             continue;
-        HTMLFormControlElement* element = static_cast<HTMLFormControlElement*>(form->associatedElements()[i]);
+        HTMLFormControlElement* element = toHTMLFormControlElement(form->associatedElements()[i]);
         if (element->hasLocalName(HTMLNames::inputTag)
             || element->hasLocalName(HTMLNames::selectTag))
             tempVector.append(element);
     }
     result.assign(tempVector);
 }
 
 bool WebFormElement::checkValidityWithoutDispatchingEvents()
 {
     return unwrap<HTMLFormElement>()->checkValidityWithoutDispatchingEvents();
@@ skipping 14 matching lines @@
     m_private = e;
     return *this;
 }
 
 WebFormElement::operator PassRefPtr<HTMLFormElement>() const
 {
     return static_cast<HTMLFormElement*>(m_private.get());
 }
 
 } // namespace WebKit