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This reverts commit 93873650.

Reason for revert: The mixin isn't necessary anymore.
Ignore-CQ-Freeze: true

Original change's description:
> [mac-rel-swarming] add arm-64 Mac to the target bots
>
> ARM Mac bots have 'arm64' cpu dimension.
> https://chromium-swarm-dev.appspot.com/bot?id=build201-a9
>
> Adding Ignore-CQ-Freeze because this isn't for production.
>
> Ignore-CQ-Freeze: true
> Bug: 1103470
> Change-Id: I3d3713909994a88224aec6c9eaf48e9d0890d2ab
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2320714
> Commit-Queue: Junji Watanabe <jwata@google.com>
> Reviewed-by: Ben Pastene <bpastene@chromium.org>
> Reviewed-by: Erik Staab <estaab@chromium.org>
> Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
> Auto-Submit: Junji Watanabe <jwata@google.com>
> Cr-Commit-Position: refs/heads/master@{#792461}

TBR=estaab@chromium.org,martiniss@chromium.org,tikuta@chromium.org,bpastene@chromium.org,jwata@google.com,yekuang@google.com

Change-Id: Ic96fb6dbb7934065cffeb637c132d23ff3202c0f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1103470
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2325452
Auto-Submit: Junji Watanabe <jwata@google.com>
Reviewed-by: Erik Staab <estaab@chromium.org>
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Erik Staab <estaab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792543}