diff -r 000000000000 -r 6474c204b198 ipc/glue/CrossProcessMutex_unimplemented.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ipc/glue/CrossProcessMutex_unimplemented.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,46 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * 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 "CrossProcessMutex.h"
+
+#include "nsDebug.h"
+
+namespace mozilla {
+
+CrossProcessMutex::CrossProcessMutex(const char*)
+{
+  NS_RUNTIMEABORT("Cross-process mutices not allowed on this platform.");
+}
+
+CrossProcessMutex::CrossProcessMutex(CrossProcessMutexHandle)
+{
+  NS_RUNTIMEABORT("Cross-process mutices not allowed on this platform.");
+}
+
+CrossProcessMutex::~CrossProcessMutex()
+{
+  NS_RUNTIMEABORT("Cross-process mutices not allowed on this platform - woah! We should've aborted by now!");
+}
+
+void
+CrossProcessMutex::Lock()
+{
+  NS_RUNTIMEABORT("Cross-process mutices not allowed on this platform - woah! We should've aborted by now!");
+}
+
+void
+CrossProcessMutex::Unlock()
+{
+  NS_RUNTIMEABORT("Cross-process mutices not allowed on this platform - woah! We should've aborted by now!");
+}
+
+CrossProcessMutexHandle
+CrossProcessMutex::ShareToProcess(base::ProcessHandle aHandle)
+{
+  NS_RUNTIMEABORT("Cross-process mutices not allowed on this platform - woah! We should've aborted by now!");
+  return 0;
+}
+
+}