Allow Junk to be synced.

It isn't enabled by default, but we should permit the user to
sync it if desired.

Change-Id: I8b058f6a510bcb77f0f9ab4113ad59e0200d08d2
(cherry picked from commit 6506c8ec2c09be76ee70bba69fcd70d64a11982f)
1 file changed