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Update expiration dates, or add one if the histogram doesn't already
have one. For histograms that we still need, set the expiry to M85,
which is around a year from now.

Bug: 976053
Change-Id: Icb71ebf6137b40644cb63976682cdf3437ec2948
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1663074Reviewed-by: mark a. foltz <mfoltz@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Brandon Tolsch <btolsch@chromium.org>
Commit-Queue: Takumi Fujimoto <takumif@chromium.org>
Cr-Commit-Position: refs/heads/master@{#670337}