diff -r 000000000000 -r 6474c204b198 xpcom/glue/nsTArrayForwardDeclare.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/glue/nsTArrayForwardDeclare.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,39 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* 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 nsTArrayForwardDeclare_h__
+#define nsTArrayForwardDeclare_h__
+
+//
+// This simple header file contains forward declarations for the TArray family
+// of classes.
+//
+// Including this header is preferable to writing
+//
+//   template<class E> class nsTArray;
+//
+// yourself, since this header gives us flexibility to e.g. change the default
+// template parameters.
+//
+
+#include <stdint.h>
+
+template<class E>
+class nsTArray;
+
+template<class E>
+class FallibleTArray;
+
+template<class E, uint32_t N>
+class nsAutoTArray;
+
+template<class E, uint32_t N>
+class AutoFallibleTArray;
+
+#define InfallibleTArray nsTArray
+#define AutoInfallibleTArray nsAutoTArray
+
+#endif