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The test suite already instantiates a FieldTrialList as per
https://chromium-review.googlesource.com/c/chromium/src/+/1883567 so
it's no longer necessary to do so explicitly in tests.

This patch addresses unit tests under:
/components/sync

This CL was uploaded by git cl split.

R=vitaliii@chromium.org

Bug: 1018667
Change-Id: I361805aad758e19356c63f6321b890b9cd4715ff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1917764
Auto-Submit: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: vitaliii <vitaliii@chromium.org>
Commit-Queue: vitaliii <vitaliii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715798}