Update script to fetch new WebCore IDL

third_party/WebCore/css/StyleSheetList.idl

Index: third_party/WebCore/css/StyleSheetList.idl
diff --git a/third_party/WebCore/css/StyleSheetList.idl b/third_party/WebCore/css/StyleSheetList.idl
new file mode 100644
index 0000000000000000000000000000000000000000..3a7b185cd9d3a7bb25a8700ebf0386a578ef30aa
--- /dev/null
+++ b/third_party/WebCore/css/StyleSheetList.idl
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2006, 2007, 2009 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 stylesheets {
+
+    // Introduced in DOM Level 2:
+    interface [
+        JSGenerateIsReachable=ImplDocument,
+        IndexedGetter,
+        NamedGetter,
+        V8DependentLifetime
+    ] StyleSheetList {
+        readonly attribute unsigned long    length;
+        StyleSheet         item(in [Optional=DefaultIsUndefined] unsigned long index);
+    };
+
+}