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This reverts commit eab3705f.

Reason for revert: regression reported in https://crbug.com/870171

Original change's description:
> Delay audio service launch on the browser startup.
> 
> (see the bug) From the traces the service/process creation gets posted to the
> IO thread during startup.
> It may be delaying startup for some other services needed for the first paint, or it may be
> just eating up CPU when the load is already quite high. We'll experiment with delaying
> the service launch.
> 
> Bug: 867461
> Change-Id: I048e33d049e665d8e9489046c5813918d8077524
> Reviewed-on: https://chromium-review.googlesource.com/1153248
> Commit-Queue: Olga Sharonova <olka@chromium.org>
> Reviewed-by: Gabriel Charette <gab@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#579460}

TBR=gab@chromium.org,olka@chromium.org

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

Bug: 867461
Change-Id: If0751dd76f8e880d0fc8454c6707778de5ce6685
Reviewed-on: https://chromium-review.googlesource.com/1162183Reviewed-by: Marina Ciocea <marinaciocea@chromium.org>
Commit-Queue: Marina Ciocea <marinaciocea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580819}