diff -r 000000000000 -r 6474c204b198 content/base/src/nsAtomListUtils.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/base/src/nsAtomListUtils.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,25 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * Static helper class for implementing atom lists.
+ */
+
+#ifndef nsAtomListUtils_h__
+#define nsAtomListUtils_h__
+
+#include <stdint.h>
+
+class nsIAtom;
+struct nsStaticAtom;
+
+class nsAtomListUtils {
+public:
+    static bool IsMember(nsIAtom *aAtom,
+                           const nsStaticAtom* aInfo,
+                           uint32_t aInfoCount);
+};
+
+#endif /* !defined(nsAtomListUtils_h__) */