diff -r 000000000000 -r 6474c204b198 xpcom/glue/nsEnumeratorUtils.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/glue/nsEnumeratorUtils.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,26 @@
+/* -*- 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/. */
+
+#ifndef nsEnumeratorUtils_h__
+#define nsEnumeratorUtils_h__
+
+#include "nscore.h"
+
+class nsISupports;
+class nsISimpleEnumerator;
+
+NS_COM_GLUE nsresult
+NS_NewEmptyEnumerator(nsISimpleEnumerator* *aResult);
+
+NS_COM_GLUE nsresult
+NS_NewSingletonEnumerator(nsISimpleEnumerator* *result,
+                          nsISupports* singleton);
+
+NS_COM_GLUE nsresult
+NS_NewUnionEnumerator(nsISimpleEnumerator* *result,
+                      nsISimpleEnumerator* firstEnumerator,
+                      nsISimpleEnumerator* secondEnumerator);
+
+#endif /* nsEnumeratorUtils_h__ */