diff -r 000000000000 -r 6474c204b198 dom/tests/mochitest/general/file_interfaces.xml
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/tests/mochitest/general/file_interfaces.xml	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,20 @@
+<?xml version="1.0"?>
+<bindings id="xbltestBindings" xmlns="http://www.mozilla.org/xbl">
+  <binding id="xbltest">
+    <content>PASS</content>
+    <implementation>
+      <constructor>
+        var win = XPCNativeWrapper.unwrap(window);
+        var SpecialPowers = win.SpecialPowers;
+        var is = win.is;
+        var todo_is = win.todo_is;
+        var ok = win.ok;
+        var legacyMozPrefixedInterfaces = win.legacyMozPrefixedInterfaces;
+        var createInterfaceMap = win.createInterfaceMap;
+        eval(win.runTest.toString());
+        runTest(true);
+        win.SimpleTest.finish();
+      </constructor>
+    </implementation>
+  </binding>
+</bindings>