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This reverts commit 375c6457.

Reason for revert: Breaks Google Chrome Linux x64:
https://ci.chromium.org/buildbot/chromium.chrome/Google%20Chrome%20Linux%20x64/28713

Original change's description:
> components/proximity_auth: Make this component CrOS-only.
> 
> This is true in practice.
> 
> R=​khorimoto@chromium.org, sky@chromium.org
> 
> Bug: none
> Test: none
> Change-Id: I14ec85e9b4c34bc0ee94ebae2ca9b9d782c8e5f4
> Reviewed-on: https://chromium-review.googlesource.com/962863
> Reviewed-by: Scott Violet <sky@chromium.org>
> Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
> Commit-Queue: James Hawkins <jhawkins@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#543214}

TBR=jhawkins@chromium.org,sky@chromium.org,khorimoto@chromium.org

Change-Id: Ie10b48da189c3a80900bac3693ed345c5df92258
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: none
Reviewed-on: https://chromium-review.googlesource.com/963584Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543217}