/usr/share/upstart/sessions/untrusted-helper-logrotate.conf is in ubuntu-app-launch 0.5+15.10.20150817-0ubuntu3.
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 | description "Untrusted Helper Logs need a shorter lifecycle"
# Run after log rotate
start on stopped logrotate
script
logdir=${XDG_CACHE_HOME:-$HOME/.cache}/upstart
#
# If a log is older than two days we're clearing it
#
find ${logdir} -mtime +2 -name "untrusted-helper-*.log.[1-9].gz" -delete
end script
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