Remove noparent from components/downloads/quarantine/OWNERS.

noparent in OWNERS files are discouraged.

Bug: none
Change-Id: If51c8918d012be9298711b10ce1982b2a7881373
Reviewed-on: https://chromium-review.googlesource.com/c/1297263Reviewed-by: Asanka Herath <asanka@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602321}

components/download/quarantine/OWNERS

-set noparent
-
 asanka@chromium.org
 wfh@chromium.org