diff -r 000000000000 -r 6474c204b198 xpcom/glue/GenericFactory.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/glue/GenericFactory.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,26 @@
+/* -*- 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 "mozilla/GenericFactory.h"
+
+namespace mozilla {
+
+NS_IMPL_ISUPPORTS(GenericFactory, nsIFactory)
+
+NS_IMETHODIMP
+GenericFactory::CreateInstance(nsISupports* aOuter, REFNSIID aIID,
+			       void** aResult)
+{
+  return mCtor(aOuter, aIID, aResult);
+}
+
+NS_IMETHODIMP
+GenericFactory::LockFactory(bool aLock)
+{
+  NS_ERROR("Vestigial method, never called!");
+  return NS_ERROR_FAILURE;
+}
+
+} // namespace mozilla