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We default most tests to having the trial enabled because that is the expected way forward. Nevertheless we put the trial so we can control rollout or kill it after the fact.

BUG=488602
TBR=asvitkine
TEST=FormStructureTest*,AutofillServerTest*

Review URL: https://codereview.chromium.org/1141133003

Cr-Commit-Position: refs/heads/master@{#330601}