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We can do better than just dropping the DB, by dropping just the older
versions of the duplicate cookie --- this is how M65 would behave when
loading the store, so it preserves old behavior.

This is probably too late for Chrome, but may help other embedders.

Bug: 835990
Change-Id: I25bf87d46574346a47c05b35152fa3c42f9aa7a9
Reviewed-on: https://chromium-review.googlesource.com/1097204Reviewed-by: Victor Costan <pwnall@chromium.org>
Commit-Queue: Maks Orlovich <morlovich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567018}