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After https://chromium-review.googlesource.com/c/chromium/src/+/2391798,
some WebRTC chromium.webrtc.fyi bots have started to fail because of
an #import error on ScreenTime.h (see [1]).

This CL updates these bots to use the same xcode build used by Chromium.

[1] - https://ci.chromium.org/p/chromium/builders/webrtc.fyi/WebRTC%20Chromium%20FYI%20ios-device/7252

Bug: 1123704
Change-Id: I5cc8d0af6b41ef81725d96dbce0f1854f15eed6e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2391155Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Mirko Bonadei <mbonadei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804704}