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UKM EG tests were failing on iOS because the signed in account was staying
around after signing out causing EG selector to fail to tap on the
appropriate account in subsequent sign in attempts. This CL fixes that by
removing the signed in account when signing out.

Bug: 853992
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I77ec271bbb694766b6487be52ec4e3a18f7839d4
Reviewed-on: https://chromium-review.googlesource.com/1146986Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577511}