diff -r 000000000000 -r 6474c204b198 xpcom/io/nsMultiplexInputStream.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/io/nsMultiplexInputStream.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,29 @@
+/* -*- 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 multiplex stream concatenates a list of input streams into a single
+ * stream.
+ */
+
+#ifndef _nsMultiplexInputStream_h_
+#define _nsMultiplexInputStream_h_
+
+#include "nsIMultiplexInputStream.h"
+
+#define NS_MULTIPLEXINPUTSTREAM_CONTRACTID "@mozilla.org/io/multiplex-input-stream;1"
+#define NS_MULTIPLEXINPUTSTREAM_CID                  \
+{ /* 565e3a2c-1dd2-11b2-8da1-b4cef17e568d */         \
+    0x565e3a2c,                                      \
+    0x1dd2,                                          \
+    0x11b2,                                          \
+    {0x8d, 0xa1, 0xb4, 0xce, 0xf1, 0x7e, 0x56, 0x8d} \
+}
+
+extern nsresult nsMultiplexInputStreamConstructor(nsISupports *outer,
+                                                  REFNSIID iid,
+                                                  void **result);
+
+#endif //  _nsMultiplexInputStream_h_