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Delay expiry of frequently used histograms.

Updates the expires_after attribute for 49 histograms that show
frequent access in the past 90 days.  These are the 90% most
frequently used histograms over that time that do not already have a date later
than or within 60 days of 2020-11-15.

TBR=chromium-metrics-reviews@google.com

Change-Id: I3d67fb25e93988a9449bfd355ee5856db8c74771
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2208751Reviewed-by: Chrome Metrics Logs <chrome-metrics-team+robot@google.com>
Commit-Queue: Chrome Metrics Logs <chrome-metrics-team+robot@google.com>
Cr-Commit-Position: refs/heads/master@{#770194}