Update script to fetch new WebCore IDL

third_party/WebCore/css/CSSCharsetRule.idl

Index: third_party/WebCore/css/CSSCharsetRule.idl
diff --git a/third_party/WebCore/css/CSSCharsetRule.idl b/third_party/WebCore/css/CSSCharsetRule.idl
new file mode 100644
index 0000000000000000000000000000000000000000..3cdaf4a78625baab4e88441aa3464a403c8a4966
--- /dev/null
+++ b/third_party/WebCore/css/CSSCharsetRule.idl
@@ -0,0 +1,33 @@
+/*
+ * 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.
+ */
+
+module css {
+
+    // Introduced in DOM Level 2:
+    interface CSSCharsetRule : CSSRule {
+#if defined(LANGUAGE_OBJECTIVE_C) && LANGUAGE_OBJECTIVE_C
+        readonly attribute [TreatReturnedNullStringAs=Null] DOMString encoding;
+#else
+                 attribute [TreatReturnedNullStringAs=Null, TreatNullAs=NullString] DOMString encoding
+                     setter raises(DOMException);
+#endif
+    };
+
+}