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This reverts commit 48d32d67.

Reason for revert: FDIO doesn't handle overrides as expected.

Original change's description:
> [Fuchsia] Allow namespace overrides in base::LaunchProcess
> 
> Previously base::LaunchProcess didn't allow paths_to_transfer to be used
> with the FDIO_SPAWN_CLONE_NAMESPACE flag. This meant that to override
> directories the test launcher had to avoid FDIO_SPAWN_CLONE_NAMESPACE
> flag. This is not ideal because of the added complexity in the test
> launcher and also because the launcher was changing test environment
> by not cloning all entries in the namespace (i.e. some tests would behave
> differently when started with --single-process-tests flag). This change
> updates LaunchProcess() to allow individual dirs transfer while cloning
> the rest of the namespace. Also updated test launcher to use this new
> feature.
> 
> This CL should unbreak the tests currently broken in
> https://crrev.com/c/1341243
> 
> Change-Id: I3c30497222ffd33d6240f478523d3e767fad90f5
> Reviewed-on: https://chromium-review.googlesource.com/c/1345236
> Reviewed-by: Scott Graham <scottmg@chromium.org>
> Reviewed-by: Nico Weber <thakis@chromium.org>
> Commit-Queue: Nico Weber <thakis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#610042}

TBR=thakis@chromium.org,kmarshall@chromium.org,sergeyu@chromium.org,scottmg@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: Iecb39de51037b41cc4b75914c688e1b412dcce71
Reviewed-on: https://chromium-review.googlesource.com/c/1351788Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611007}