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This reverts commit e1f49aca.

Reason for revert: Breaks build - linker error (see bug)

Bug: 1165994

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}

TBR=sorin@chromium.org,waffles@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com

Change-Id: I0acf2fce533e34424465c4ce65202a53881feb4d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1014630
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2626351Reviewed-by: Dana Fried <dfried@google.com>
Commit-Queue: Dana Fried <dfried@google.com>
Cr-Commit-Position: refs/heads/master@{#842780}