This reverts commit 18905f7828.
Reason for revert: suspected cause of https://issues.chromium.org/362910001
Original change's description:
> Parallel process launching
>
> This change adds support for parallel process launching on Windows.
>
> Background: Processes are launched on a launcher thread, but this thread
> can become bottlenecked if launching multiple processes simultaneously.
> Most of the time spent in the launcher thread is observed to be in the
> CreateProcess call.
>
> This change makes process launching async by moving the target creation
> work to the thread pool. This frees up the launcher thread so it can
> accept tasks more quickly, and multiple target creations can now run in
> parallel.
>
> --enable-features=WinSboxParallelProcessLaunch
>
> Bug: 1499551
> Tests: sbox_integration_tests ParallelLaunchTest.*
> Change-Id: I7add6a6a68d31868a41fb433b223695ff36d8769
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5015584
> Reviewed-by: Will Harris <wfh@chromium.org>
> Commit-Queue: Ben Bamesberger <benb@microsoft.com>
> Reviewed-by: Alex Gough <ajgo@chromium.org>
> Reviewed-by: Caitlin Fischer <caitlinfischer@google.com>
> Reviewed-by: Bo Liu <boliu@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1348194}
Bug: 1499551, 362910001
Change-Id: I0f1a61945b48d4877d044a988f35b58a05076ac5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5836201
Reviewed-by: Bo Liu <boliu@chromium.org>
Commit-Queue: Will Harris <wfh@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Caitlin Fischer <caitlinfischer@google.com>
Cr-Commit-Position: refs/heads/main@{#1350864}
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