Promote myself as owner of ash/clipboard/views

:)

Change-Id: I0839f1dae395b051d912e97e107a2d9fb8a89eed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2629662
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Commit-Queue: Alex Newcomer <newcomer@chromium.org>
Auto-Submit: Andrew Xu <andrewxu@chromium.org>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843706}

ash/clipboard/views/OWNERS

+andrewxu@chromium.org