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This change extends expiring PasswordManager and PasswordGeneration
histograms and marks "PasswordManager.OtherPossibleUsernamesUsage" as
obsolete.

R=chromium-metrics-reviews@google.com

Fixed: 1165103, 1165104, 1165114, 1165115, 1165116, 1165118, 1165119
Change-Id: Ib2bd28896c05ddb9c24fe7f191299a7e58e39321
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2632651
Auto-Submit: Jan Wilken Dörrie <jdoerrie@chromium.org>
Commit-Queue: Brian White <bcwhite@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845771}