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This reverts commit b642822f.

This CL is causing a shutdown crash.
  https://bugs.chromium.org/p/chromium/issues/detail?id=1142247

It will be merged back into next canary with the fix.


Original change's description:
> Move ISpVoice instance to a worker thread
>
> This CL is moving the speech synthesizer code to a worker thread.
>
> The TtsPlatformImpl is using an ISpVoice COM interface to perform
> text-to-speech actions. The instance was living on the UI Main
> Thread which was using STA Apartment.
>
> This CL is splitting the logic in two parts. The first part is the
> control logic which stay on the UI Thread. The second part is the
> synthesizer logic which is running on a worker thread.
>
> Bug: 869399, 1133813
> Change-Id: I8f8d939950cc39637f87d101ed362123a51e985e
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2462341
> Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
> Reviewed-by: François Doray <fdoray@chromium.org>
> Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#820340}

TBR=dmazzoni@chromium.org,fdoray@chromium.org,etienneb@chromium.org

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

Bug: 869399
Bug: 1133813
Change-Id: I6249ad2d5d7938e8aa960bbd8d0798f7396513ff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2499602Reviewed-by: François Doray <fdoray@chromium.org>
Commit-Queue: Etienne Bergeron <etienneb@google.com>
Cr-Commit-Position: refs/heads/master@{#820887}