diff -r 000000000000 -r 6474c204b198 js/xpconnect/src/XPCJSWeakReference.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/xpconnect/src/XPCJSWeakReference.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,27 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* vim: set ts=8 sts=4 et sw=4 tw=99: */
+/* 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 xpcjsweakreference_h___
+#define xpcjsweakreference_h___
+
+#include "xpcIJSWeakReference.h"
+#include "nsIWeakReference.h"
+#include "mozilla/Attributes.h"
+
+class xpcJSWeakReference MOZ_FINAL : public xpcIJSWeakReference
+{
+public:
+    xpcJSWeakReference();
+    nsresult Init(JSContext* cx, const JS::Value& object);
+
+    NS_DECL_ISUPPORTS
+    NS_DECL_XPCIJSWEAKREFERENCE
+
+private:
+    nsCOMPtr<nsIWeakReference> mReferent;
+};
+
+#endif // xpcjsweakreference_h___