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This change sets all DisplayManager.* histograms to have expiry date
2021-07-15 and owners zentaro@chromium.org, cros-peripherals@google.com.

This should make auditing easier as all notifications about histogram
expirt will be sent to the same people at the same time.

Bug: 1088714
Change-Id: Iae992cd4dfcf071447894add22acf7f2bccae1e9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2468303Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Commit-Queue: Nick Czajka <czajka@google.com>
Cr-Commit-Position: refs/heads/master@{#817210}