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This reverts commit 44a2bf3d.

Reason for revert: New test times out.
https://ci.chromium.org/p/chromium/builders/ci/Linux%20Chromium%20OS%20ASan%20LSan%20Tests%20%281%29/38462

Original change's description:
> [lacros] Support mojo connection in testing environment
> 
> This CL supports setting up mojo connection between lacros and ash in
> testing and debugging environment, and it is done via a unix domain
> socket.
> 
> Unix domain socket is only used in testing, not production because it
> allows a random process to connect to ash-chrome as long as it knows
> the socket path.
> 
> Currently, only one lacros-chrome is allowed to connect to ash-chrome,
> so in the testing environment, test launcher will run tests serially,
> and will change to run in parallel once ash-chrome supports multiple
> clients.
> 
> Bug: 1120582
> Change-Id: I9736b03218f8fe937a7d642a35d6ee49b7e081f6
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2384543
> Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
> Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
> Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#805537}

TBR=jorgelo@chromium.org,hidehiko@chromium.org,liaoyuke@chromium.org

Change-Id: I911a4d8bd80e8f0a217243503986a1a6d4a16338
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1120582
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2403460Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Commit-Queue: Morten Stenshorne <mstensho@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805696}