Delay expiry of frequently used histograms.

Updates the expires_after attribute for 245 histograms that show
frequent access in the past 180 days.  These are the 99% most
frequently used histograms over that time that do not already
have a date later than or within 60 days of 2021-09-27.

TBR=chromium-metrics-reviews@google.com

Change-Id: Ia14d8eb922970d1d710fe764f0f7d3f2d93eaf7a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2992892
Commit-Queue: Chrome Metrics Logs <chrome-metrics-team+robot@google.com>
Bot-Commit: Chrome Metrics Logs <chrome-metrics-team+robot@google.com>
Cr-Commit-Position: refs/heads/master@{#896821}