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This will need a follow up cleanup cl once the parameter is changed in
the variations config.

BUG=b/160157778

Change-Id: I6f29d98223eeb04de880e302870af642e6e73292
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2507340Reviewed-by: Jesse Doherty <jwd@chromium.org>
Reviewed-by: Caitlin Fischer <caitlinfischer@google.com>
Commit-Queue: Jesse Doherty <jwd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823228}