Remove UserAgent ShadowRoot + Author ShadowRoot code.

third_party/WebKit/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 261 matching lines @@
 
 protected:
     HTMLInputElement(Document&, HTMLFormElement*, bool createdByParser);
 
     void defaultEventHandler(Event*) override;
 
 private:
     enum AutoCompleteSetting { Uninitialized, On, Off };
 
     void didAddUserAgentShadowRoot(ShadowRoot&) final;
-    void willAddFirstAuthorShadowRoot() final;
 
     void willChangeForm() final;
     void didChangeForm() final;
     InsertionNotificationRequest insertedInto(ContainerNode*) override;
     void removedFrom(ContainerNode*) final;
     void didMoveToNewDocument(Document& oldDocument) final;
     void removeAllEventListeners() final;
 
     bool hasCustomFocusLogic() const final;
     bool isKeyboardFocusable() const final;
@@ skipping 108 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.
     Member<HTMLImageLoader> m_imageLoader;
     Member<ListAttributeTargetObserver> m_listAttributeTargetObserver;
 };
 
 } // namespace blink
 
 #endif // HTMLInputElement_h