/usr/share/upstart/sessions/address-book-updater.conf is in address-book-updater 0.1.1+16.04.20151211.1-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | description "address-book-update"
author "Renato Araujo Oliveira Filho <renato.filho@canonical.com>"
start on started address-book-service and started msyncd and started sync-monitor
stop on runlevel [06]
exec /usr/lib/x86_64-linux-gnu/address-book-service/address-book-updater --sync
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