custom-tabs-client: Remove pasko from OWNERS

Justification: as in http://crrev.com/c/1529410/
Change-Id: I00ce8b2e800484f05945cb483b90decc198fedbd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1529054
Commit-Queue: Peter Conn <peconn@chromium.org>
Reviewed-by: Peter Conn <peconn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#641836}
2 files changed