Fix error in test suite from testElementCrash.html; did not have callbacks.js

test/data/support/testElementCrash.html

@@ -8,6 +8,7 @@
 		}
 	</style>
 	<script src="../../../src/core.js"></script>
+	<script src="../../../src/callbacks.js"></script>
 	<script src="../../../src/deferred.js"></script>
 	<script src="../../../src/support.js"></script>
 </head>