Make WebNode::to<Type>() (and toConst) casts contain type asserts.

third_party/WebKit/Source/web/WebInputElement.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 131 matching lines @@
 void WebInputElement::setShouldRevealPassword(bool value)
 {
     unwrap<HTMLInputElement>()->setShouldRevealPassword(value);
 }
 
 WebInputElement::WebInputElement(const PassRefPtrWillBeRawPtr<HTMLInputElement>& elem)
     : WebFormControlElement(elem)
 {
 }
 
+DEFINE_WEB_NODE_TYPE_CASTS(WebInputElement, isHTMLInputElement(constUnwrap<Node>()));
+
 WebInputElement& WebInputElement::operator=(const PassRefPtrWillBeRawPtr<HTMLInputElement>& elem)
 {
     m_private = elem;
     return *this;
 }
 
 WebInputElement::operator PassRefPtrWillBeRawPtr<HTMLInputElement>() const
 {
     return toHTMLInputElement(m_private.get());
 }
 
 WebInputElement* toWebInputElement(WebElement* webElement)
 {
     if (!isHTMLInputElement(*webElement->unwrap<Element>()))
         return 0;
 
     return static_cast<WebInputElement*>(webElement);
 }
 } // namespace blink