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Also use iOS 10 simulator provided by the appropriate Xcode, and do not rely on
legacy simulators installed on the bot.

R=justincohen@chromium.org

Bug: 835036
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I933dc552a030d9410550df5ac1cd0090b6508a47
Reviewed-on: https://chromium-review.googlesource.com/1028666Reviewed-by: Justin Cohen <justincohen@chromium.org>
Commit-Queue: Sergey Berezin <sergeyberezin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555888}