Remove eugenebut from base/ios/OWNERS

Bug: none
Change-Id: Iffa8026d0c0a73bdc85ca0a8c6b7285920cb52b6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2640574Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845221}

base/ios/OWNERS

-eugenebut@chromium.org
 rohitrao@chromium.org
-sdefresne@chromium.org
\ No newline at end of file
+sdefresne@chromium.org