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Now that |low_entropy_provider| is used later in
VariationsFieldTrialCreator::SetupFieldTrials(),
VariationsFieldTrialCreator::CreateTrialsFromSeed() shouldn't
own |low_entropy_provider|.

Bug: 1138603
Change-Id: I53ba8d2b7160bd3c9f02e92af4bd53ca72c63f25
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2525856
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826023}