Introduce toHTMLInputElement(Node*), and use it.

Source/WebKit/chromium/src/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 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 2199 matching lines @@
     return info;
 }
 
 WebTextInputType WebViewImpl::textInputType()
 {
     Node* node = focusedWebCoreNode();
     if (!node)
         return WebTextInputTypeNone;
 
     if (node->hasTagName(HTMLNames::inputTag)) {
-        HTMLInputElement* input = static_cast<HTMLInputElement*>(node);
+        HTMLInputElement* input = toHTMLInputElement(node);
 
         if (input->isDisabledOrReadOnly())
             return WebTextInputTypeNone;
 
         if (input->isPasswordField())
             return WebTextInputTypePassword;
         if (input->isSearchField())
             return WebTextInputTypeSearch;
         if (input->isEmailField())
             return WebTextInputTypeEmail;
@@ skipping 1857 matching lines @@
 }
 
 bool WebViewImpl::shouldDisableDesktopWorkarounds()
 {
     ViewportArguments arguments = mainFrameImpl()->frame()->document()->viewportArguments();
     return arguments.width == ViewportArguments::ValueDeviceWidth || !arguments.userZoom
         || (arguments.minZoom == arguments.maxZoom && arguments.minZoom != ViewportArguments::ValueAuto);
 }
 
 } // namespace WebKit