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Recent patches introduced the initialization of FieldTrialList as part
of the test suite, hence it's no longer necessary to do so explicitly.

This patch addresses unit tests related to metrics and variations.

Bug: 1018667
Change-Id: If091b24ca3a4943841228d850c0166c14ffb3db8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1884730Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715142}