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Also cleans up the relevant code in the fieldtrial testing config.

Bug: 978849, 1006806
Change-Id: Iecd7f06dd245dbbe9bfca17523b3ebafbc98d372
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2154527
Commit-Queue: Caitlin Fischer <caitlinfischer@google.com>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760164}