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This is a reland of b9f529d2

The underlying host has been updated to 10.14.

Original change's description:
> Promote Mac10.14 Tests to main waterfall
>
> Mac10.14 Tests is now stable and green, and is ready to be promoted
> to the main waterfall alongside its prior-release siblings. This CL
> makes a few changes to accomplish that:
> 1) Updates the OS of the existing main waterfall Mac Builder to 10.14
> 2) Moves Mac 10.14 Tests to be triggered by Mac Builder
> 3) Moves it from just master (like all FYI bots) to exist in branch CI
>    as well
> 4) Moves it from FYI to CI consoles
>
> This change leaves Mac Builder Next intact, so that it can be updated
> and used for 10.15 soon.
>
> Bug: 1018852
> Change-Id: I3d5723ab7c565c37681696acb2f2de79ddcac1f2
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2036769
> Commit-Queue: Aaron Gable <agable@chromium.org>
> Auto-Submit: Aaron Gable <agable@chromium.org>
> Reviewed-by: John Budorick <jbudorick@chromium.org>
> Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#746074}

Bug: 1018852
No-Try: true
Change-Id: Iba891f297a9c9a492f1d289d72a3dd178a2b5b19
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2083953Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746179}