/etc/apparmor.d/abstractions/ubuntu-unity7-messaging is in apparmor 2.8.95~2430-0ubuntu5.
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 | #
# Access required for connecting to/communicating with the Unity messaging
# indicator
#
dbus (receive, send)
bus=session
path="/com/canonical/indicator/messages/*",
|