ash: Update //ash/laser/OWNERS.

Bug: none
Change-Id: I801959a08e5b544e0738f7932a5a2c4622c484c0
Reviewed-on: https://chromium-review.googlesource.com/937813Reviewed-by: David Reveman <reveman@chromium.org>
Commit-Queue: Dan Erat <derat@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539192}

ash/laser/OWNERS

+kaznacheev@chromium.org
 reveman@chromium.org
-sammiequon@chromium.org
 
 # COMPONENT: UI>Shell