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This reverts commit 5351d11f.

Reason for revert: https://ci.chromium.org/p/chromium/builders/ci/Fuchsia%20x64/39025

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=wez@chromium.org,ianloic@chromium.org

Change-Id: Ie266c435355009b8846ed2368fc2c97195f24d6c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1729476Reviewed-by: Owen Min <zmin@chromium.org>
Commit-Queue: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682895}