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This reverts commit 4db68ed9.

Reason for revert: Seems to cause failures on Mac ASan 64 Tests (see crbug.com/806712).

Original change's description:
> [Variations] Avoid duplication of the safe seed value stored in prefs.
> 
> When the safe seed and the latest seed have identical contents, use a sentinel
> value to avoid storing a duplicate value for the two seeds. This is purely a
> storage space optimization; no difference in observed functionality is expected.
> 
> R=​asvitkine@chromium.org
> 
> Bug: 727984
> Change-Id: Ica641a479228b0cdfcc4af2ec04ddfc54c36c5eb
> Reviewed-on: https://chromium-review.googlesource.com/880482
> Commit-Queue: Ilya Sherman <isherman@chromium.org>
> Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#532027}

TBR=isherman@chromium.org,asvitkine@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 727984, 806712
Change-Id: Ic5de33c61bb2acf88d7445ded4f0a1743ab7f456
Reviewed-on: https://chromium-review.googlesource.com/891119Reviewed-by: vitaliii <vitaliii@chromium.org>
Commit-Queue: vitaliii <vitaliii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532401}