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Change the config to refer to the beta configuration.

Bug: 1108002
Change-Id: I54df3a07cd40695a7f8fcac42784e7c999265962
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2360606
Auto-Submit: David Trainor <dtrainor@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Commit-Queue: Mark Pearson <mpearson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799304}