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This reverts commit 52f13686.

Reason for revert: I should just use the custom trigger script and dimension sets instead ...

Original change's description:
> Move the CQ Mac layout tests from 10.12 to 10.13.
> 
> Currently the Mac10.13 Tests bot runs the layout tests on 10.12;
> this is done because we didn't have enough capacity on 10.13 to
> run them. This CL is one of a series that is attempting to fix this.
> 
> In this particular CL, this switches the test step from 100%
> 10.12 to 50% 10.13, and also updates the chromium.clang ToTMac
> and 'Chromium Mac 10.13' bots to get around the unneeded hacks.
> 
> A subsequent CL will ramp this to 100% (non-experimental) once
> we're sure we have the capacity.
> 
> BUG=853356
> 
> Change-Id: I4a772f4bd82f427fde1931417dd60d0f80a8d40a
> Reviewed-on: https://chromium-review.googlesource.com/1109458
> Reviewed-by: John Budorick <jbudorick@chromium.org>
> Commit-Queue: Dirk Pranke <dpranke@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#569147}

TBR=dpranke@chromium.org,tikuta@chromium.org,jbudorick@chromium.org

Change-Id: I8cd37858ad7fe16a43009168d0d16a0535dac7e5
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 853356
Reviewed-on: https://chromium-review.googlesource.com/1108619Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569153}