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This is a reland of e1f49aca

Original change's description:
> Move installer.cc file to updater/win directory.
>
> The installer API code is Windows-specific and it would be desirable
> to isolate //chrome/updater from its implementation details.
>
> This change uses public_deps and visibility to make
> updater:lib and updater/win:lib act as a unit, to resolve the issue
> of the circular includes as suggested by the GN documentation.
>
> Bug: 1014630
>
> Change-Id: Ib47dc9041af08651549d0feaf35790f336dfe193
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2588508
> Commit-Queue: Sorin Jianu <sorin@chromium.org>
> Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#842765}

Bug: 1014630
Change-Id: I84d717aad974254f5daf24547888c8bf880cf9be
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2635202Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Commit-Queue: Sorin Jianu <sorin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844981}