Introduce toHTMLSelectElement and remove isHTMLSelectElement

Source/web/WebSearchableFormData.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 125 matching lines @@
 // Returns true if the form element is in its default state, false otherwise.
 // The default state is the state of the form element on initial load of the
 // page, and varies depending upon the form element. For example, a checkbox is
 // in its default state if the checked state matches the state of the checked attribute.
 bool IsInDefaultState(HTMLFormControlElement* formElement)
 {
     if (formElement->hasTagName(HTMLNames::inputTag)) {
         const HTMLInputElement* inputElement = toHTMLInputElement(formElement);
         if (inputElement->isCheckbox() || inputElement->isRadioButton())
             return inputElement->checked() == inputElement->hasAttribute(checkedAttr);
-    } else if (formElement->hasTagName(HTMLNames::selectTag))
-        return IsSelectInDefaultState(static_cast<HTMLSelectElement*>(formElement));
+    } else if (formElement->hasTagName(HTMLNames::selectTag)) {
+        return IsSelectInDefaultState(toHTMLSelectElement(formElement));
+    }
     return true;
 }
 
 // Look for a suitable search text field in a given HTMLFormElement 
 // Return nothing if one of those items are found:
 //  - A text area field
 //  - A file upload field 
 //  - A Password field
 //  - More than one text field
 HTMLInputElement* findSuitableSearchInputElement(const HTMLFormElement* form)
@@ skipping 132 matching lines @@
 
     String action(formElement->action());
     KURL url(formElement->document()->completeURL(action.isNull() ? "" : action));
     RefPtr<FormData> formData = FormData::create(encodedString);
     url.setQuery(formData->flattenToString());
     m_url = url;
     m_encoding = String(encoding.name()); 
 }
 
 } // namespace WebKit