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We intend to launch PWA Omnibox install in 76 so update expiry to be 3
milestones later.

Bug: 907351
Change-Id: Ib6f59f1184f5a0a046a488fa2570d026cf5f69ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1580987
Auto-Submit: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#653578}