Support display: contents for elements, first-line and first-letter pseudos.

third_party/WebKit/Source/core/html/HTMLOptionElement.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, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google 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
@@ skipping 91 matching lines @@
   void detachLayoutTree(const AttachContext& = AttachContext()) override;
   void parseAttribute(const QualifiedName&,
                       const AtomicString&,
                       const AtomicString&) override;
   InsertionNotificationRequest insertedInto(ContainerNode*) override;
   void removedFrom(ContainerNode*) override;
   void accessKeyAction(bool) override;
   void childrenChanged(const ChildrenChange&) override;
   String innerText() override;
 
-  // <option> never has a layoutObject so we manually manage a cached style.
-  void updateNonComputedStyle();
-  ComputedStyle* nonLayoutObjectComputedStyle() const override;
-  PassRefPtr<ComputedStyle> customStyleForLayoutObject() override;
   void didAddUserAgentShadowRoot(ShadowRoot&) override;
 
   String collectOptionInnerText() const;
 
   void updateLabel();
 
   // Represents 'selectedness'.
   // https://html.spec.whatwg.org/multipage/forms.html#concept-option-selectedness
   bool m_isSelected;
   // Represents 'dirtiness'.
   // https://html.spec.whatwg.org/multipage/forms.html#concept-option-dirtiness
   bool m_isDirty = false;
-  RefPtr<ComputedStyle> m_style;
 };
 
 }  // namespace blink
 
 #endif  // HTMLOptionElement_h