Remove CSSCharsetRule

Source/core/css/CSSCharsetRule.h

Index: Source/core/css/CSSCharsetRule.h
diff --git a/Source/core/css/CSSCharsetRule.h b/Source/core/css/CSSCharsetRule.h
deleted file mode 100644
index e6a0425257dc3028b23fe19203b03c6fc03003b5..0000000000000000000000000000000000000000
--- a/Source/core/css/CSSCharsetRule.h
+++ /dev/null
@@ -1,59 +0,0 @@
-/*
- * (C) 1999-2003 Lars Knoll (knoll@kde.org)
- * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
- * Copyright (C) 2002, 2006, 2008, 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,
- * 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 CSSCharsetRule_h
-#define CSSCharsetRule_h
-
-#include "core/css/CSSRule.h"
-
-namespace blink {
-
-class CSSCharsetRule final : public CSSRule {
-    DEFINE_WRAPPERTYPEINFO();
-public:
-    static PassRefPtrWillBeRawPtr<CSSCharsetRule> create(CSSStyleSheet* parent, const String& encoding)
-    {
-        return adoptRefWillBeNoop(new CSSCharsetRule(parent, encoding));
-    }
-
-    virtual ~CSSCharsetRule() { }
-
-    virtual String cssText() const override;
-    virtual void reattach(StyleRuleBase* rule) override { ASSERT_UNUSED(rule, !rule); }
-
-    const String& encoding() const { return m_encoding; }
-    void setEncoding(const String& encoding) { m_encoding = encoding; }
-
-    virtual void trace(Visitor* visitor) override { CSSRule::trace(visitor); }
-
-private:
-    CSSCharsetRule(CSSStyleSheet* parent, const String& encoding);
-
-    virtual CSSRule::Type type() const override { return CHARSET_RULE; }
-
-    String m_encoding;
-};
-
-DEFINE_CSS_RULE_TYPE_CASTS(CSSCharsetRule, CHARSET_RULE);
-
-} // namespace blink
-
-#endif // CSSCharsetRule_h