diff -r 000000000000 -r 6474c204b198 caps/include/nsSystemPrincipal.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/caps/include/nsSystemPrincipal.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,44 @@
+/* -*- Mode: C++; tab-width: 4; 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/. */
+
+/* The privileged system principal. */
+
+#ifndef nsSystemPrincipal_h__
+#define nsSystemPrincipal_h__
+
+#include "nsIPrincipal.h"
+#include "nsJSPrincipals.h"
+
+#define NS_SYSTEMPRINCIPAL_CID \
+{ 0x4a6212db, 0xaccb, 0x11d3, \
+{ 0xb7, 0x65, 0x0, 0x60, 0xb0, 0xb6, 0xce, 0xcb }}
+#define NS_SYSTEMPRINCIPAL_CONTRACTID "@mozilla.org/systemprincipal;1"
+
+
+class nsSystemPrincipal : public nsJSPrincipals
+{
+public:
+    // Our refcount is managed by nsJSPrincipals.  Use this macro to avoid
+    // an extra refcount member.
+    NS_DECL_ISUPPORTS_INHERITED
+    NS_DECL_NSIPRINCIPAL
+    NS_DECL_NSISERIALIZABLE
+
+    nsSystemPrincipal();
+
+    virtual void GetScriptLocation(nsACString &aStr) MOZ_OVERRIDE;
+
+#ifdef DEBUG
+    virtual void dumpImpl() MOZ_OVERRIDE;
+#endif 
+
+protected:
+    virtual ~nsSystemPrincipal(void);
+
+    // XXX Probably unnecessary.  See bug 143559.
+    NS_DECL_OWNINGTHREAD
+};
+
+#endif // nsSystemPrincipal_h__