Updated test infra OWNERS

Made zhaoyangli and stkhapugin the owners of EG infra. Made zhaoyangli
and olivierrobin the owners of test infra.

Bug: None
Change-Id: Ieedec52a5798353ed3bcf622302fb1ea279b2113
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2643262
Commit-Queue: Eugene But <eugenebut@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Zhaoyang Li <zhaoyangli@chromium.org>
Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846164}

ios/chrome/test/OWNERS

-eugenebut@chromium.org
+olivierrobin@chromium.org
+stkhapugin@chromium.org
+zhaoyangli@chromium.org
 
 # This is for the common case of adding or renaming files. If you're doing
 # structural changes, use usual OWNERS rules.

ios/chrome/test/earl_grey/OWNERS

-eugenebut@chromium.org
+stkhapugin@chromium.org
+zhaoyangli@chromium.org
 
 # This is for the common case of adding or renaming files. If you're doing
 # structural changes, use usual OWNERS rules.

ios/testing/earl_grey/OWNERS

-eugenebut@chromium.org
+stkhapugin@chromium.org
+zhaoyangli@chromium.org