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This is a reland of 765c53e1

Original change's description:
> infra: Migrate builders to Goma RBE (iOS Week 1a)
> 
> These are the two builders in webrtc.fyi:
> - WebRTC Chromium FYI ios-device
> - WebRTC Chromium FYI ios-simulator
> 
> These builders are small. They are expected to have a peak traffic of
> 15 QPS:
> https://docs.google.com/spreadsheets/d/1-XKh-CqSoUcXEqCETVywjmIo1C18P0qEBDCY50ozBb0/edit#gid=1721756715
> 
> Schedule of migration:
> https://docs.google.com/spreadsheets/d/1TZhpasm6iceYm7zqkyEtZ1wn9ZcpREfH4LV4cusICJA/edit#gid=0
> 
> R=agable@chromium.org, bpastene@chromium.org, jbudorick@chromium.org, tikuta@chromium.org
> 
> Bug: 950413
> Change-Id: Id47cc7887bbefaf4dfe9f72275b80c8f04c428a7
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2043185
> Reviewed-by: Yoshisato Yanagisawa <yyanagisawa@google.com>
> Reviewed-by: Ben Pastene <bpastene@chromium.org>
> Reviewed-by: smut <smut@google.com>
> Commit-Queue: Simon Que <sque@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#739771}

Bug: 950413
Change-Id: Id3ffe0babda0e347bd80dce0c253d93c5ad29946
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2089176Reviewed-by: John Budorick <jbudorick@chromium.org>
Reviewed-by: smut <smut@google.com>
Commit-Queue: Simon Que <sque@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747624}