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Because time_serialization.cc stored Time and DeltaTime in
microseconds, and Time since the windows epoch, which is the exact
same way that PrefService is storing these time fields, this change
should be fully backwards compatible.

Bug: 853755
Change-Id: I22d734d030ca550a654319e37abf6653890c1bdb
Reviewed-on: https://chromium-review.googlesource.com/1104581Reviewed-by: Filip Gorski <fgorski@chromium.org>
Commit-Queue: Sky Malice <skym@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568282}