diff -r 000000000000 -r 6474c204b198 xpcom/ds/nsWindowsRegKey.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/ds/nsWindowsRegKey.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,43 @@
+/* -*- 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 nsWindowsRegKey_h__
+#define nsWindowsRegKey_h__
+
+//-----------------------------------------------------------------------------
+
+#include "nsIWindowsRegKey.h"
+
+/**
+ * This ContractID may be used to instantiate a windows registry key object
+ * via the XPCOM component manager.
+ */
+#define NS_WINDOWSREGKEY_CONTRACTID "@mozilla.org/windows-registry-key;1"
+
+/**
+ * This function may be used to instantiate a windows registry key object prior
+ * to XPCOM being initialized.
+ */
+extern "C" nsresult
+NS_NewWindowsRegKey(nsIWindowsRegKey **result);
+
+//-----------------------------------------------------------------------------
+
+#ifdef IMPL_LIBXUL
+
+// a53bc624-d577-4839-b8ec-bb5040a52ff4
+#define NS_WINDOWSREGKEY_CID \
+  { 0xa53bc624, 0xd577, 0x4839, \
+    { 0xb8, 0xec, 0xbb, 0x50, 0x40, 0xa5, 0x2f, 0xf4 } }
+
+extern nsresult
+nsWindowsRegKeyConstructor(nsISupports *outer, const nsIID &iid, void **result);
+
+#endif  // IMPL_LIBXUL
+
+//-----------------------------------------------------------------------------
+
+#endif  // nsWindowsRegKey_h__