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This CL expires old captures after 72 hours in order to allow for
previews to be reasonably current.

Bug: TODO
Change-Id: I0c86c928dc73564e3721d4d8f79b8b7693931619
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2386223Reviewed-by: Mehran Mahmoudi <mahmoudi@chromium.org>
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803946}