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We use ints for capturing and passing around deltas of time. This CL
moves all of those uses to base::TimeDelta, which benefits us by
being clearer about units (e.g. seconds, mins, etc) and semantics
in tests.

Bug: 878979
Change-Id: I5ad1cfc105882b63af7a974a72576212c773cb4a
Reviewed-on: https://chromium-review.googlesource.com/c/1492991
Commit-Queue: Sam Goto <goto@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Auto-Submit: Sam Goto <goto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636529}