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This implements the change from https://github.com/WICG/native-file-system/pull/207

Change-Id: Ib496775f1c7e1a2c7b4be4f56232739acfc0d020
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2311054Reviewed-by: Victor Costan <pwnall@chromium.org>
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Commit-Queue: Jeremy Roman <jbroman@chromium.org>
Auto-Submit: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791255}