Remove eugenebut from ios/web owners

Bug: None
Change-Id: I5c8684a3f17f2f147bb04a41ab84ba503aa56ae0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2633193
Auto-Submit: Eugene But <eugenebut@chromium.org>
Commit-Queue: Ali Juma <ajuma@chromium.org>
Reviewed-by: Ali Juma <ajuma@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844516}

ios/web/OWNERS

 ajuma@chromium.org
-eugenebut@chromium.org
 gambard@chromium.org

ios/web/browsing_data/OWNERS

-eugenebut@chromium.org
 gambard@chromium.org
 
 per-file system_cookie_store_util_unittest.mm=mrefaat@chromium.org

ios/web/download/OWNERS

-eugenebut@chromium.org
 sdefresne@chromium.org

ios/web/favicon/OWNERS

-eugenebut@chromium.org
 gambard@chromium.org

ios/web/navigation/OWNERS

 ajuma@chromium.org
-danyao@chromium.org
-eugenebut@chromium.org

ios/web/public/download/OWNERS

-eugenebut@chromium.org
 sdefresne@chromium.org

ios/web/public/test/OWNERS

-eugenebut@chromium.org

ios/web/public/webui/OWNERS

-eugenebut@chromium.org
 michaeldo@chromium.org

ios/web/session/OWNERS

-eugenebut@chromium.org

ios/web/web_state/ui/OWNERS

-danyao@chromium.org
-eugenebut@chromium.org