Update script to fetch new WebCore IDL

third_party/WebCore/dom/TreeWalker.idl

Index: third_party/WebCore/dom/TreeWalker.idl
diff --git a/third_party/WebCore/dom/TreeWalker.idl b/third_party/WebCore/dom/TreeWalker.idl
new file mode 100644
index 0000000000000000000000000000000000000000..d9ed36eabd8e8166b04d62235918aad12488618c
--- /dev/null
+++ b/third_party/WebCore/dom/TreeWalker.idl
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2006 Apple Computer, Inc.
+ * 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 traversal {
+
+    // Introduced in DOM Level 2:
+    interface [
+        JSCustomMarkFunction
+    ] TreeWalker {
+        readonly attribute Node root;
+        readonly attribute unsigned long whatToShow;
+        readonly attribute NodeFilter filter;
+        readonly attribute boolean expandEntityReferences;        
+                 attribute Node currentNode
+                     setter raises(DOMException);
+
+        [CallWith=ScriptState] Node parentNode();
+        [CallWith=ScriptState] Node firstChild();
+        [CallWith=ScriptState] Node lastChild();
+        [CallWith=ScriptState] Node previousSibling();
+        [CallWith=ScriptState] Node nextSibling();
+        [CallWith=ScriptState] Node previousNode();
+        [CallWith=ScriptState] Node nextNode();
+    };
+
+}