diff -r 000000000000 -r 6474c204b198 xpcom/glue/DeadlockDetector.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/glue/DeadlockDetector.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,11 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: sw=4 ts=4 et :
+ * 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/. */
+
+#include "DeadlockDetector.h"
+
+namespace mozilla {
+const CallStack CallStack::kNone((CallStack::callstack_id) -1);
+}