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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}