Remove CSSCharsetRule

Source/core/css/CSSCharsetRule.idl

Index: Source/core/css/CSSCharsetRule.idl
diff --git a/Source/core/css/CSSCharsetRule.idl b/Source/core/css/CSSCharsetRule.idl
deleted file mode 100644
index 1635a719012c17140bb13660d01dda1a765e25ee..0000000000000000000000000000000000000000
--- a/Source/core/css/CSSCharsetRule.idl
+++ /dev/null
@@ -1,23 +0,0 @@
-/*
- * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
- * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
- *
- * 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.
- */
-
-interface CSSCharsetRule : CSSRule {
-    [MeasureAs=CSSCharsetRuleEncoding] attribute DOMString encoding;
-};