GitLab

iossim no longer automatically launches the Simulator, that must be
done manually. Also, macOS 10.12 is required for Xcode 9.

TBR=rohitrao

Bug: none.
Change-Id: Icab37c48a6b79fbbe3e5a99b89a67058e215ca98
Reviewed-on: https://chromium-review.googlesource.com/824562
Commit-Queue: Mike Pinkerton <pinkerton@chromium.org>
Reviewed-by: Mike Pinkerton <pinkerton@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523786}