set noparent

# Bug component: 78010

aaliomer@google.com
aroederer@google.com
jeffdq@google.com
juliacr@google.com
juliatuttle@google.com
lynhan@google.com
steell@google.com
yurilin@google.com

per-file MediaNotificationProcessor.java = ethibodeau@google.com, asc@google.com