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This reverts commit 630672d6.

Reason for revert: attempts to extract linux build: https://ci.chromium.org/p/chromium/builders/ci/Mac10.13%20Tests/20794

Original change's description:
> Make Mac10.X Tests builders into thin testers
> 
> This will free up a small amount of Mac hardware which can be
> used elsewhere. It also creates a template for other OSes with
> builder/tester splits to follow.
> 
> We know that this works because the mac-osxbeta-rel CI builder
> already does this (as can be seen by the smaller diff in its
> generated config).
> 
> Bug: 1003062
> Change-Id: Iecdb68404dd3ae16eabfc657981f0e82478a040a
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1974510
> Auto-Submit: Garrett Beaty <gbeaty@chromium.org>
> Reviewed-by: Stephen Martinis <martiniss@chromium.org>
> Commit-Queue: Stephen Martinis <martiniss@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#726077}

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

Change-Id: Ide3b7335f67e1b48cbaf0cb1a9c69ce4211c0f33
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1003062
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1974614Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726105}