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Delay expiry of frequently used histograms.

Updates the expires_after attribute for 175 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 2021-02-14.

TBR=chromium-metrics-reviews@google.com

Change-Id: I72efdeebd966a7e2d6c1a420c4b7612fd6474a9d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2362648Reviewed-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@{#799205}