Remove tons of OILPAN.

sky/engine/core/html/HTMLStyleElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 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 25 matching lines @@
 class HTMLStyleElement final : public HTMLElement, private StyleElement {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtr<HTMLStyleElement> create(Document&, bool createdByParser);
     virtual ~HTMLStyleElement();
 
     ContainerNode* scopingNode();
 
     using StyleElement::sheet;
 
-    virtual void trace(Visitor*) override;
-
 private:
     HTMLStyleElement(Document&, bool createdByParser);
 
     // overload from HTMLElement
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) override;
     virtual InsertionNotificationRequest insertedInto(ContainerNode*) override;
     virtual void didNotifySubtreeInsertionsToDocument() override;
     virtual void removedFrom(ContainerNode*) override;
     virtual void childrenChanged(const ChildrenChange&) override;
 
     virtual void finishParsingChildren() override;
 
     virtual const AtomicString& media() const override;
     virtual const AtomicString& type() const override;
 };
 
 } // namespace blink
 
 #endif // HTMLStyleElement_h