Introduce toHTMLFormControlElement, and use it.

Source/WebKit/chromium/src/WebPasswordFormUtils.cpp

 /* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
@@ skipping 47 matching lines @@
 void findPasswordFormFields(HTMLFormElement* form, PasswordFormFields* fields)
 {
     ASSERT(form);
     ASSERT(fields);
 
     HTMLInputElement* latestInputElement = 0;
     const Vector<FormAssociatedElement*>& formElements = form->associatedElements();
     for (size_t i = 0; i < formElements.size(); i++) {
         if (!formElements[i]->isFormControlElement())
             continue;
-        HTMLFormControlElement* formElement = static_cast<HTMLFormControlElement*>(formElements[i]);
-        if (formElement->isActivatedSubmit())
-            fields->submit = formElement;
+        HTMLFormControlElement* control = toHTMLFormControlElement(formElements[i]);
+        if (control->isActivatedSubmit())
+            fields->submit = control;
 
-        if (!formElement->hasTagName(HTMLNames::inputTag))
+        if (!control->hasTagName(HTMLNames::inputTag))
             continue;
 
-        HTMLInputElement* inputElement = toHTMLInputElement(formElement);
+        HTMLInputElement* inputElement = toHTMLInputElement(control);
         if (inputElement->isDisabledFormControl())
             continue;
 
         if ((fields->passwords.size() < maxPasswords)
             && inputElement->isPasswordField()) {
             // We assume that the username is the input element before the
             // first password element.
             if (fields->passwords.isEmpty() && latestInputElement) {
                 fields->userName = latestInputElement;
                 // Remove the selected username from alternateUserNames.
                 if (!fields->alternateUserNames.isEmpty() && !latestInputElement->value().isEmpty())
                     fields->alternateUserNames.removeLast();
             }
             fields->passwords.append(inputElement);
         }
 
         // Various input types such as text, url, email can be a username field.
         if (inputElement->isTextField() && !inputElement->isPasswordField()) {
             latestInputElement = inputElement;
             // We ignore elements that have no value. Unlike userName, alternateUserNames
             // is used only for autofill, not for form identification, and blank autofill
             // entries are not useful.
             if (!inputElement->value().isEmpty())
                 fields->alternateUserNames.append(inputElement->value());
         }
     }
 }
 
 } // namespace WebKit