Update renderer to layoutObject in core/html.

Source/core/html/HTMLOptGroupElement.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.
  *
  * 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 37 matching lines @@
     explicit HTMLOptGroupElement(Document&);
 
     virtual bool supportsFocus() const override;
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) override;
     virtual void childrenChanged(const ChildrenChange&) override;
     virtual void accessKeyAction(bool sendMouseEvents) override;
     virtual void didAddUserAgentShadowRoot(ShadowRoot&) override;
     virtual void attach(const AttachContext& = AttachContext()) override;
     virtual void detach(const AttachContext& = AttachContext()) override;
 
-    // <optgroup> might not have a renderer so we manually manage a cached style.
+    // <optgroup> might not have a layoutObject so we manually manage a cached style.
     void updateNonComputedStyle();
     virtual ComputedStyle* nonLayoutObjectComputedStyle() const override;
     virtual PassRefPtr<ComputedStyle> customStyleForLayoutObject() override;
 
     void updateGroupLabel();
     void recalcSelectOptions();
 
     RefPtr<ComputedStyle> m_style;
 };
 
 } // namespace blink
 
 #endif // HTMLOptGroupElement_h