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This reverts commit 1a9c502d.

Reason for revert: Speculative revert to fix headless_browsertests hangs https://ci.chromium.org/buildbot/chromium.win/Win7%20Tests%20%281%29/79454

Original change's description:
> Do not block shutdown for process launch on Windows
> 
> Launching a process is racy with browser shutdown, and blocks it. So we
> see shutdown hangs when process launch takes a long time. This CL makes
> the process launcher use a CONTINUE_ON_SHUTDOWN instead of
> BLOCK_SHUTDOWN task on Windows where it's presumably safe to do so given
> no non-leaky globals are used, and based on local testing. This is not
> safe on Linux since the process launcher there uses SandboxHostLinux
> which is a non-leaky base::Singleton.
> 
> R=​brucedawson,gab
> BUG=830954
> 
> Change-Id: Ia8c5295924288819dcfdcc087d282a05e6ee7e55
> Reviewed-on: https://chromium-review.googlesource.com/1020720
> Reviewed-by: Antoine Labour <piman@chromium.org>
> Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
> Reviewed-by: Gabriel Charette <gab@chromium.org>
> Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#553294}

TBR=gab@chromium.org,sunnyps@chromium.org,brucedawson@chromium.org,piman@chromium.org

Change-Id: I4999a60d9f805fe441f416803dbb71fab8747f1b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 830954
Reviewed-on: https://chromium-review.googlesource.com/1026437Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553388}