Bug 485175 Make geolocation tests even more reliable r=dougt

dom/tests/mochitest/geolocation/test_optional_api_params.html

@@ -105,6 +105,10 @@ try {
 }
 ok(!exception, exception);
 
+// Successful calls trigger a geolocation notification,
+// so clean up ready for the next test.
+clickNotificationButton(kDenyButton);
+
 </script>
 </pre>
 </body>