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Previously we would only clone the stdio FDs into the child if the
option.fds_to_map was empty. Callers instead expect that stdio FDs will
always be cloned into the child, but can also be overridden via the
fds_to_map option.

Bug: 706592
Change-Id: Ifd401b75ceda3b8fe1fb69604ff361ba50b2f40d
Reviewed-on: https://chromium-review.googlesource.com/598749
Commit-Queue: Wez <wez@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Scott Graham <scottmg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491782}