Add new owners to chrome/browser/chromeos/drive/

Bug: None
Change-Id: I67d1337c2b72ed23937863bdd33db52de9ac8383
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2143025Reviewed-by: Sergei Datsenko <dats@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Commit-Queue: Austin Tankiang <austinct@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757746}

chrome/browser/chromeos/drive/OWNERS

+austinct@chromium.org
+dats@chromium.org
 hashimoto@chromium.org
 hidehiko@chromium.org
 hirono@chromium.org