/usr/share/upstart/sessions/gnome-settings-daemon.conf is in gnome-settings-daemon 3.8.6.1-0ubuntu11.
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 | description "The Gnome Settings Daemon"
author "Stéphane Graber <stgraber@ubuntu.com>"
start on started dbus and starting gnome-session INSTANCE=GNOME
stop on stopping gnome-session
respawn
exec /usr/lib/gnome-settings-daemon/gnome-settings-daemon
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