diff -r 000000000000 -r 6474c204b198 dom/xbl/nsXBLSerialize.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/xbl/nsXBLSerialize.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,35 @@
+/* -*- Mode: C++; tab-width: 2; 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/. */
+
+#include "nsXBLSerialize.h"
+
+#include "jsfriendapi.h"
+#include "js/OldDebugAPI.h"
+#include "nsXBLPrototypeBinding.h"
+#include "nsIXPConnect.h"
+#include "nsContentUtils.h"
+#include "nsCxPusher.h"
+
+using namespace mozilla;
+
+nsresult
+XBL_SerializeFunction(nsIObjectOutputStream* aStream,
+                      JS::Handle<JSObject*> aFunction)
+{
+  AssertInCompilationScope();
+  AutoJSContext cx;
+  MOZ_ASSERT(js::GetContextCompartment(cx) == js::GetObjectCompartment(aFunction));
+  return nsContentUtils::XPConnect()->WriteFunction(aStream, cx, aFunction);
+}
+
+nsresult
+XBL_DeserializeFunction(nsIObjectInputStream* aStream,
+                        JS::MutableHandle<JSObject*> aFunctionObjectp)
+{
+  AssertInCompilationScope();
+  AutoJSContext cx;
+  return nsContentUtils::XPConnect()->ReadFunction(aStream, cx,
+                                                   aFunctionObjectp.address());
+}