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This is the updater's equivalent to mini_installer.

Bug: 995805
Change-Id: I6e126fc3dd0e56073a28299a6e9ef3c39fca8232
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1761636
Commit-Queue: Joshua Pawlicki <waffles@chromium.org>
Commit-Queue: Michael Moss <mmoss@chromium.org>
Auto-Submit: Joshua Pawlicki <waffles@chromium.org>
Reviewed-by: Michael Moss <mmoss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688570}