diff -r 000000000000 -r 6474c204b198 dom/system/gonk/nsIVolumeMountLock.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/system/gonk/nsIVolumeMountLock.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+/* 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 "nsISupports.idl"
+
+[scriptable, uuid(44449f34-5ca1-4aff-bce6-22c79263de24)]
+interface nsIVolumeMountLock : nsISupports
+{
+    void unlock();
+};
+