Remove log of user events, which has been imported to [MetricsTimeline](https://trac.torproject.org/projects/tor/wiki/doc/MetricsTimeline). ([diff](https://trac.torproject.org/projects/tor/wiki/doc/meek?action=diff&version=256)) URL: https://trac.torproject.org/projects/tor/wiki/doc/meek?version=256