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This reverts commit cca7402b.

Reason for revert: This made the FuchsiaCdmManager tests flaky. See crbug.com/1143067

Original change's description:
> [Fuchsia] Move CDM data file i/o off main thread
>
> The FuchsiaCdmManager needs to create directories for each origin to
> pass to the platform CDM services to fulfill EME origin isolation
> requirements. The FuchsiaCdmManager runs on the main thread and the
> calls to CreateDirectoryAndGetError are potentially blocking. This CL
> moves the directory creation step to a background task.
>
> Bug: 1140655
> Change-Id: I060edc909976e7b5a493afc3bc9a2a26e26994be
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2500532
> Reviewed-by: Wez <wez@chromium.org>
> Commit-Queue: RJ Ascani <rjascani@google.com>
> Cr-Commit-Position: refs/heads/master@{#821353}

TBR=wez@chromium.org,rjascani@google.com

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

Bug: 1140655, 1143067
Change-Id: I06955764f82f32f3aa96443f91ffd566aede3b91
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2505977Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Auto-Submit: RJ Ascani <rjascani@google.com>
Cr-Commit-Position: refs/heads/master@{#822164}