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Tests often have indirect dependencies to code that requires a
FieldTrialList instantiated. To work that around, many existing tests
manually instantiate a FieldTrialList, but this is cumbersome,
distracting and hard to clean up once it no longer is necessary.

Instead, this patch adopts base::test::ScopedFeatureList as part of the
test suite for all tests.

Follow-up patches will simplify tests.

Bug: 1018667
Change-Id: I15b1f1097357f0fc3a30d4ac337d77b1ef607098
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1883567
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714882}