Delay expiry of frequently used histograms.

Updates the expires_after attribute for 192 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 2020-12-15.

TBR=chromium-metrics-reviews@google.com

Change-Id: I8b442083abbb88214e00221a95fb1184968e9b1b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2415052
Reviewed-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@{#807725}