/usr/share/upstart/sessions/upstart-dbus-session-bridge.conf is in upstart 1.13.2-0ubuntu21.
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 8 9 10 11 12 13 14 15 16 | # upstart-dbus-bridge - Bridge D-Bus signal events into upstart
#
# This helper daemon receives D-Bus signal events and
# emits equivalent Upstart events.
description "Bridge D-Bus session bus signal events into upstart"
emits dbus
start on started dbus
stop on stopping dbus
expect daemon
respawn
exec upstart-dbus-bridge --daemon --session --user --bus-name session
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