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This reverts commit b46672aa.

Reason for revert: crbug.com/1030521

Original change's description:
> Add branched versions of Phase B CI builders.
> 
> All branch CI builders have been moved to be scheduled once per day. As
> we get capacity and get the builds into a good state, we will move them
> to be continuously triggered.
> 
> Bug: 1024641, 922150
> Change-Id: Ie066240907dd581175c94cbca431e5a6bf37deb3
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1948050
> Reviewed-by: Aaron Gable <agable@chromium.org>
> Commit-Queue: Aaron Gable <agable@chromium.org>
> Auto-Submit: Garrett Beaty <gbeaty@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#721218}

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

Change-Id: I717e2f06feba96a3d3b64b89f92a4821b9368c00
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1024641, 922150
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1951363Reviewed-by: Garrett Beaty <gbeaty@chromium.org>
Commit-Queue: Garrett Beaty <gbeaty@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721595}