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This is a reland of 5351d11f

Original change's description:
> [Fuchsia] Update to new FIDL string and vector APIs
>
> This removes usages of the old API that will become build failures when
> deprecation warnings are turned on.
>
> See: https://fuchsia-review.googlesource.com/c/fuchsia/+/304389
> Change-Id: Ie5db014401d79787101b2b4b6e7585fd7a23b1ce
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1727375
> Commit-Queue: Ian McKellar <ianloic@chromium.org>
> Reviewed-by: Wez <wez@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#682796}

TBR=ianloic

Change-Id: I805e7e0274e5f42bcbb8c53ef2afa57186d85582
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1728722Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683008}