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Also bumps the expiration of all the histograms to June 2021. No other
behavioral changes.

Bug: 1165072, 1165073
Change-Id: I7c78f6a9220167c050fb6aa50990ad92699b13a6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2630830Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846317}