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SandboxPolicyFuchsia is not thread affine but its ServiceDirectory
is not. This CL schedules the ServiceDirectory's deletion on the
same thread that was used for its construction.

Change-Id: I98e950481e49106ba64c759cef2c903b5dcf5d3b
Reviewed-on: https://chromium-review.googlesource.com/1171673Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582457}