diff -r 000000000000 -r 6474c204b198 xpcom/glue/nsArrayEnumerator.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/glue/nsArrayEnumerator.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,31 @@
+/* -*- 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 nsArrayEnumerator_h__
+#define nsArrayEnumerator_h__
+
+// enumerator implementation for nsIArray
+
+#include "nscore.h"
+
+class nsISimpleEnumerator;
+class nsIArray;
+class nsCOMArray_base;
+
+// Create an enumerator for an existing nsIArray implementation
+// The enumerator holds an owning reference to the array.
+NS_COM_GLUE nsresult
+NS_NewArrayEnumerator(nsISimpleEnumerator* *result,
+                      nsIArray* array);
+
+// create an enumerator for an existing nsCOMArray<T> implementation
+// The enumerator will hold an owning reference to each ELEMENT in
+// the array. This means that the nsCOMArray<T> can safely go away
+// without its objects going away.
+NS_COM_GLUE nsresult
+NS_NewArrayEnumerator(nsISimpleEnumerator* *aResult,
+                      const nsCOMArray_base& aArray);
+
+#endif