GitLab

This reverts commit 8af6bfe2.

Reason for revert: The branched versions have not been updated to run
the non-isolated tests on the builder instead of the tester.

Original change's description:
> Use linux hosts for all mac triggered testers
> 
> We've already shown this to work on Mac10.15 Tests on the FYI
> waterfall, so let's do this for the rest of the Mac triggered
> testers on the main waterfall as well. This will allow us to
> free up some Mac resources to do more important tasks (e.g.
> compile, run tests). It also makes these builders builderless,
> increasing our flexibility and improving our utilization.
> 
> This CL also introduces a new ci.triggered_tester starlark
> function to enable easily specifying builders as "we don't care
> what OS you use", and to enable easily turning all of them into
> "thin testers" if/when we go down that path.
> 
> Bug: 1061582
> Change-Id: Iffd5a4afbadeabc19d9d0e3b28f33151a9474191
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2161689
> Reviewed-by: Garrett Beaty <gbeaty@chromium.org>
> Commit-Queue: Aaron Gable <agable@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#761718}

TBR=ellyjones@chromium.org,agable@chromium.org,gbeaty@chromium.org

Change-Id: I786079f17db5e32643b11bb43775b7e52a44e4cc
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1061582
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2163254Reviewed-by: Garrett Beaty <gbeaty@chromium.org>
Cr-Commit-Position: refs/heads/master@{#762027}