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This reverts commit 5c614415.

Reason for revert: The CL is missing an important piece of validation code. 'generate_buildboy_json.py --check' needs to validate the new bucket files, which it does not in this CL.

Original change's description:
> infra: Generate source side spec by bucket
> 
> Doesn't include internal builders.
> 
> Bug: 1028719
> Change-Id: Iec40cb84086ed23cd7d5ca60c317296460466497
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2033847
> Commit-Queue: Gregory Guterman <guterman@google.com>
> Reviewed-by: Stephen Martinis <martiniss@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#745574}

TBR=agable@chromium.org,martiniss@chromium.org,guterman@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1028719
Change-Id: I9f0beb4efc49f532eb8a25137aafc6ad35c36354
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2083621Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Gregory Guterman <guterman@google.com>
Cr-Commit-Position: refs/heads/master@{#746110}