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This reverts commit 7d53bc24.

Reason for revert: still referenced by cq.cfg.

Original change's description:
> Remove incorrect named builders ("_" underscores)
> 
> Bug: 868202
> Change-Id: I807807511df39b7a4eac3b699fcd2274d4d24138
> Reviewed-on: https://chromium-review.googlesource.com/c/1343081
> Reviewed-by: Ryan Tseng <hinoka@chromium.org>
> Reviewed-by: John Budorick <jbudorick@chromium.org>
> Commit-Queue: Eric Foo <efoo@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#609559}

TBR=hinoka@chromium.org,efoo@chromium.org,jbudorick@chromium.org

Change-Id: Ic530f835ef9367cda18f54be54dc712d3f229ded
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 868202
Reviewed-on: https://chromium-review.googlesource.com/c/1345234Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609816}