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This reverts commit 428151a2.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> Move goma builders to their own bucket.
> 
> The delegation for goma bucket into luci.chromium.ci pool has been
> fixed.
> 
> Change-Id: I08368f1db383e1b94f8f9bf731642e8d5f4a80f2
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1887656
> Commit-Queue: Garrett Beaty <gbeaty@chromium.org>
> Reviewed-by: Aaron Gable <agable@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#714230}

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

Change-Id: Ia8c6010881ba31c6785893a6f29601facfc94268
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1910280Reviewed-by: Garrett Beaty <gbeaty@chromium.org>
Commit-Queue: Garrett Beaty <gbeaty@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714235}