Fix bug where form/fieldset :valid/:invalid won't be recalculated upon control's willValidate change

Source/core/html/HTMLInputElement.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, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Samsung Electronics. 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
@@ skipping 246 matching lines @@
 
     virtual void defaultEventHandler(Event*) override;
 
 private:
     enum AutoCompleteSetting { Uninitialized, On, Off };
 
     virtual void didAddUserAgentShadowRoot(ShadowRoot&) override final;
     virtual void willAddFirstAuthorShadowRoot() override final;
 
     virtual void willChangeForm() override final;
-    virtual void didChangeForm() override final;
+    virtual void didChangeForm(HTMLFormElement* oldForm) override final;
     virtual InsertionNotificationRequest insertedInto(ContainerNode*) override;
     virtual void removedFrom(ContainerNode*) override final;
     virtual void didMoveToNewDocument(Document& oldDocument) override final;
     virtual void removeAllEventListeners() override final;
 
     virtual bool hasCustomFocusLogic() const override final;
     virtual bool isKeyboardFocusable() const override final;
     virtual bool shouldShowFocusRingOnMouseFocus() const override final;
     virtual bool isEnumeratable() const override final;
     virtual bool isInteractiveContent() const override final;
@@ skipping 101 matching lines @@
     // The ImageLoader must be owned by this element because the loader code assumes
     // that it lives as long as its owning element lives. If we move the loader into
     // the ImageInput object we may delete the loader while this element lives on.
     OwnPtrWillBeMember<HTMLImageLoader> m_imageLoader;
     OwnPtrWillBeMember<ListAttributeTargetObserver> m_listAttributeTargetObserver;
 };
 
 } // namespace blink
 
 #endif // HTMLInputElement_h