Remove more oilpan.

sky/engine/core/css/CSSDefaultStyleSheets.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2013 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
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef CSSDefaultStyleSheets_h
 #define CSSDefaultStyleSheets_h
 
-#include "platform/heap/Handle.h"
+#include "wtf/OwnPtr.h"
+#include "wtf/RefPtr.h"
 
 namespace blink {
 
 class Element;
 class RuleSet;
 class StyleSheetContents;
 
-class CSSDefaultStyleSheets : public DummyBase<CSSDefaultStyleSheets> {
+class CSSDefaultStyleSheets {
 public:
     static CSSDefaultStyleSheets& instance();
 
-    void ensureDefaultStyleSheetsForElement(Element*, bool& changedDefaultStyle);
-
     RuleSet* defaultStyle() { return m_defaultStyle.get(); }
     RuleSet* defaultViewportStyle() { return m_defaultViewportStyle.get(); }
 
     StyleSheetContents* defaultStyleSheet() { return m_defaultStyleSheet.get(); }
     StyleSheetContents* viewportStyleSheet() { return m_viewportStyleSheet.get(); }
 
-    void trace(Visitor*);
-
 private:
     CSSDefaultStyleSheets();
 
     OwnPtr<RuleSet> m_defaultStyle;
     OwnPtr<RuleSet> m_defaultViewportStyle;
 
     RefPtr<StyleSheetContents> m_defaultStyleSheet;
     RefPtr<StyleSheetContents> m_viewportStyleSheet;
 };
 
 } // namespace blink
 
 #endif // CSSDefaultStyleSheets_h