Revert of Fix update of validity cache value, so that it reflects the correct state of any ...

Source/core/html/HTMLFormControlElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 163 matching lines @@
 
     // The initial value of m_willValidate depends on the derived class. We can't
     // initialize it with a virtual function in the constructor. m_willValidate
     // is not deterministic as long as m_willValidateInitialized is false.
     mutable bool m_willValidateInitialized: 1;
     mutable bool m_willValidate : 1;
 
     // Cache of valid().
     // But "candidate for constraint validation" doesn't affect m_isValid.
     bool m_isValid : 1;
-    // Dirty flag that controls updating valid() cache.
-    bool m_validityIsDirty : 1;
 
     bool m_wasChangedSinceLastFormControlChangeEvent : 1;
     bool m_wasFocusedByMouse : 1;
 };
 
 inline bool isHTMLFormControlElement(const Element& element)
 {
     return element.isFormControlElement();
 }
 
 DEFINE_HTMLELEMENT_TYPE_CASTS_WITH_FUNCTION(HTMLFormControlElement);
 DEFINE_TYPE_CASTS(HTMLFormControlElement, FormAssociatedElement, control, control->isFormControlElement(), control.isFormControlElement());
 
 } // namespace
 
 #endif