Remove dead methods from CSSStyleSheet and StyleSheetContents.

sky/engine/core/css/CSSStyleSheet.h

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2006, 2007, 2008, 2009, 2010, 2012 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 25 matching lines @@
 
 class CSSStyleSheet final : public RefCounted<CSSStyleSheet> {
 public:
     static PassRefPtr<CSSStyleSheet> create(Node*, const KURL&);
     static PassRefPtr<CSSStyleSheet> create(PassRefPtr<StyleSheetContents>, Node* ownerNode);
 
     ~CSSStyleSheet();
 
     Node* ownerNode() const { return m_ownerNode; }
 
-    unsigned length() const;
-
     void clearOwnerNode();
 
     Document* ownerDocument() const;
     MediaQuerySet* mediaQueries() const { return m_mediaQueries.get(); }
     void setMediaQueries(PassRefPtr<MediaQuerySet>);
 
     StyleSheetContents* contents() const { return m_contents.get(); }
 
 private:
     CSSStyleSheet(PassRefPtr<StyleSheetContents>, Node* ownerNode);
 
     RefPtr<StyleSheetContents> m_contents;
     RefPtr<MediaQuerySet> m_mediaQueries;
 
     Node* m_ownerNode;
 };
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_CSS_CSSSTYLESHEET_H_