Revert 105710 - Introduce RadioButtonGroup class to keep track of the group members and required st…

Source/WebCore/html/CheckboxInputType.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2011 Apple 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.
@@ skipping 33 matching lines @@
     return adoptPtr(new CheckboxInputType(element));
 }
 
 const AtomicString& CheckboxInputType::formControlType() const
 {
     return InputTypeNames::checkbox();
 }
 
 bool CheckboxInputType::valueMissing(const String&) const
 {
-    return element()->required() && !element()->checked();
+    return !element()->checked();
 }
 
 String CheckboxInputType::valueMissingText() const
 {
     return validationMessageValueMissingForCheckboxText();
 }
 
 void CheckboxInputType::handleKeyupEvent(KeyboardEvent* event)
 {
     const String& key = event->keyIdentifier();
@@ skipping 30 matching lines @@
     // The work we did in willDispatchClick was default handling.
     event->setDefaultHandled();
 }
 
 bool CheckboxInputType::isCheckbox() const
 {
     return true;
 }
 
 } // namespace WebCore