diff -r 000000000000 -r 6474c204b198 xpcom/base/nsSystemInfo.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/base/nsSystemInfo.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,38 @@
+/* -*- Mode: C++; tab-width: 50; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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 _NSSYSTEMINFO_H_
+#define _NSSYSTEMINFO_H_
+
+#include "nsHashPropertyBag.h"
+
+class nsSystemInfo : public nsHashPropertyBag {
+public:
+    nsSystemInfo();
+
+    nsresult Init();
+
+    // Slot for NS_InitXPCOM2 to pass information to nsSystemInfo::Init.
+    // See comments above the variable definition and in NS_InitXPCOM2.
+    static uint32_t gUserUmask;
+
+protected:
+    void SetInt32Property(const nsAString &aPropertyName,
+                          const int32_t aValue);
+    void SetUint32Property(const nsAString &aPropertyName,
+                           const uint32_t aValue);
+    void SetUint64Property(const nsAString &aPropertyName,
+                           const uint64_t aValue);
+
+private:
+    ~nsSystemInfo();
+};
+
+#define NS_SYSTEMINFO_CONTRACTID "@mozilla.org/system-info;1"
+#define NS_SYSTEMINFO_CID \
+{ 0xd962398a, 0x99e5, 0x49b2, \
+{ 0x85, 0x7a, 0xc1, 0x59, 0x04, 0x9c, 0x7f, 0x6c } }
+
+#endif /* _NSSYSTEMINFO_H_ */