Cleanup owners files, src code.

Remove ygorshenin@ from OWNERS/TODOs, replace with
alemate/antrim/dpolukhin/bartfab

BUG=None
TBR=stevenjb@chromium.org,isherman@chromium.org

Review URL: https://codereview.chromium.org/925963002

Cr-Commit-Position: refs/heads/master@{#316554}