/usr/share/upstart/sessions/upstart-dconf-bridge.conf is in upstart-dconf-bridge 1.12.1-0ubuntu4.
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 | description "Bridge dconf events into session upstart"
emits dconf
start on started dbus
stop on stopped dbus
respawn
exec upstart-dconf-bridge
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