[Fuchsia] Migrate off of fdio/util.h header.

The relevant APIs have moved out to more specific headers.

Bug: 941770
Change-Id: Ic19b647e0ad94c418cc4f68e8ecae2f7207d376a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1522329
Reviewed-by: Adam Barth <abarth@chromium.org>
Reviewed-by: Fabrice de Gans-Riberi <fdegans@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#640751}
9 files changed