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This reverts commit d52f1ff6.

Reason for revert: Goma builders broke

Original change's description:
> Move goma builders to their own bucket.
> 
> Change-Id: I35ca4a7fe3a7a446c71be80ca9e029a382036ba5
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1867391
> Commit-Queue: Garrett Beaty <gbeaty@chromium.org>
> Reviewed-by: Aaron Gable <agable@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#710021}

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

Change-Id: I6422916eebc3bcf82723624501f687ac47d290b5
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1884582
Auto-Submit: Garrett Beaty <gbeaty@chromium.org>
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710075}