Change Chrome HaTS owners

Bug: none
Change-Id: Idaae709188c12ef7f8b8b94b3362e6e20983f90e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2324410Reviewed-by: Martin Šrámek <msramek@chromium.org>
Reviewed-by: Theodore Olsauskas-Warren <sauski@google.com>
Reviewed-by: Florian Uunk <feuunk@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Commit-Queue: Wei Li <weili@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795747}

chrome/browser/ui/hats/OWNERS

-kylixrd@chromium.org
-robliao@chromium.org
-weili@chromium.org
+feuunk@chromium.org
+msramek@chromium.org
+sauski@chromium.org