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This is a reland of bd916257

Original change's description:
> Switch mac_chromium_compile_db_ng to builderless
>
> Bug: 999206
> Change-Id: I91c01200552c4170ac6d18badd5bdd113396526d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1792461
> Commit-Queue: Stephen Martinis <martiniss@chromium.org>
> Commit-Queue: John Budorick <jbudorick@chromium.org>
> Auto-Submit: Stephen Martinis <martiniss@chromium.org>
> Reviewed-by: John Budorick <jbudorick@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#694874}

Bug: 999206, 956776
Change-Id: I9fa138a8fa53073b46d69c0322ada905533f8374
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1796630
Commit-Queue: Stephen Martinis <martiniss@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695786}