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Matching the changes from https://github.com/WICG/native-file-system/pull/177
Since the bindings layer doesn't support async iterables yet, this CL
does this in a bit of a hacky way, that isn't entirely web-idl
compliant. It is much closer to the desired API than what we had though,
so seems an improvement until bindings properly support async iterables.

Bug: 1011539, 1087157
Change-Id: I2eb0a3b1d6383149b769a9961bf890eaf6956b2b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2248414Reviewed-by: Trent Apted <tapted@chromium.org>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790486}