Change @chromium.org to @google.com for sauski in ui/hats/OWNERS

Bug: 1110888
Change-Id: I98f68943de1abd226016d04083ac351de3fe1bb2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2379673Reviewed-by: Martin Šrámek <msramek@chromium.org>
Commit-Queue: Theodore Olsauskas-Warren <sauski@google.com>
Cr-Commit-Position: refs/heads/master@{#802494}

chrome/browser/ui/hats/OWNERS

 feuunk@chromium.org
 msramek@chromium.org
-sauski@chromium.org
+sauski@google.com