This also removes the config for a non-existing builder.

TBR=sergiyb@chromium.org
NOTRY=true

Bug: v8:8009
Change-Id: Ic6d65bce46db9807ffcbeb51d507b51ca5311cfe
Reviewed-on: https://chromium-review.googlesource.com/1161802
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54885}