Remove CSSCharsetRule

Source/core/css/CSSCharsetRule.cpp

-/*
- * Copyright (C) 2006, 2008, 2012 Apple Inc. All rights reserved.
- * Copyright (C) 2006 Alexey Proskuryakov (ap@macrules.ru)
- *
- * 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.
- */
-
-#include "config.h"
-#include "core/css/CSSCharsetRule.h"
-
-namespace blink {
-
-CSSCharsetRule::CSSCharsetRule(CSSStyleSheet* parent, const String& encoding)
-    : CSSRule(parent)
-    , m_encoding(encoding)
-{
-}
-
-String CSSCharsetRule::cssText() const
-{
-    return "@charset \"" + m_encoding + "\";";
-}
-
-} // namespace blink