Reland "Reland "Updater: Create self-update integration test.""

This is a reland of 8c1f163b

Original change's description:
> Reland "Updater: Create self-update integration test."
>
> This is a reland of abb75945
>
> Original change's description:
> > Updater: Create self-update integration test.
> >
> > The test is only implemented for mac Chromium-branded
> > builds at this time. This is because we haven't yet
> > set up imports of Windows or Google-branded code into
> > the codebase.
> >
> > Bug: 1268555
> > Change-Id: I4c8e1d9e6edc00cde727d9bedf7285b4588c2def
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3382966


> > Auto-Submit: Joshua Pawlicki <waffles@chromium.org>
> > Reviewed-by: Sorin Jianu <sorin@chromium.org>
> > Commit-Queue: Sorin Jianu <sorin@chromium.org>
> > Cr-Commit-Position: refs/heads/main@{#961033}
>
> Bug: 1268555
> Change-Id: Ib4ec8afa7e5548715c9fdf729a2fbd7d3d7dc654
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3402642


> Reviewed-by: Sorin Jianu <sorin@chromium.org>
> Reviewed-by: Xiaoling Bao <xiaolingbao@chromium.org>
> Commit-Queue: Joshua Pawlicki <waffles@chromium.org>
> Auto-Submit: Joshua Pawlicki <waffles@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#961613}

Bug: 1268555
Change-Id: Ie62edb6cd953bfe8b9e99bf2489b8603c202cb14
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3402855


Reviewed-by: Sorin Jianu <sorin@chromium.org>
Reviewed-by: Xiaoling Bao <xiaolingbao@chromium.org>
Commit-Queue: Joshua Pawlicki <waffles@chromium.org>
Cr-Commit-Position: refs/heads/main@{#962177}