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This is a reland of 31c7133d

The change from the first patch set is to reinstate the call to Uninstall.

Original change's description:
> Updater: Implement candidate self-uninstall.
>
> Bug: 1098934
> Change-Id: I226fc7201e04dfbf1722399434e3900cedc35120
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2487940
> Commit-Queue: Joshua Pawlicki <waffles@chromium.org>
> Reviewed-by: Sorin Jianu <sorin@chromium.org>
> Auto-Submit: Joshua Pawlicki <waffles@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#821372}

Bug: 1098934
Change-Id: I5affeb8ef8a2ba447e33a9d4efc1059184fef58c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2505459
Commit-Queue: Joshua Pawlicki <waffles@chromium.org>
Reviewed-by: Sorin Jianu <sorin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821851}