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Delay expiry of frequently used histograms.

Updates the expires_after attribute for 70 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 2020-12-20.

TBR=chromium-metrics-reviews@google.com

Change-Id: I1898b00b3258df5a378cfa4faf00586edc04a0a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2261054Reviewed-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@{#781445}