Disable testServicesWhileSignedOut on iPhones.

This test is consistently failing on all iPhone simulators, including
iOS beta bots.

Bug: 863860
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Ie4b289fca1743a3c14acb5ae50d9a50719c9ac5a
Reviewed-on: https://chromium-review.googlesource.com/1138242
Reviewed-by: Eric Noyau <noyau@chromium.org>
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575242}
1 file changed