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This standardizes the updater at waiting at most 5 seconds for launchctl to reflect
changes.

Bug: 1151333
Change-Id: I7b15048b44a894b0244eea4fb265f59ee764e7e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2593550
Auto-Submit: Joshua Pawlicki <waffles@chromium.org>
Commit-Queue: Sorin Jianu <sorin@chromium.org>
Reviewed-by: Sorin Jianu <sorin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837113}