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This reverts commit 9fc367df.

Reason for revert: Broke bot

Original change's description:
> Linux ARM: Use swarming mixins
> 
> This change is deliberately small (only changing one builder) to make
> sure the feature is working correctly.
> 
> Bug: 880973
> Change-Id: If9ffea3eadc461a994cd7dcc409b9b8206871024
> Reviewed-on: https://chromium-review.googlesource.com/1222165
> Reviewed-by: Kenneth Russell <kbr@chromium.org>
> Commit-Queue: Stephen Martinis <martiniss@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#591241}

TBR=dpranke@chromium.org,kbr@chromium.org,martiniss@chromium.org,bpastene@chromium.org,jbudorick@chromium.org

Change-Id: I0aca3b5b53c5f74f0af8f5fc287051cc4457cdd2
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 880973
Reviewed-on: https://chromium-review.googlesource.com/1227394Reviewed-by: Stephen Martinis <martiniss@chromium.org>
Commit-Queue: Stephen Martinis <martiniss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#591484}