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This is a reland of e78513d7

Original change's description:
> Migrate authenticator.js and it's dependencies to JS modules
> 
> Bug: 1054394
> Change-Id: I106bd0edc547dc6eb2d680b409d1348d5b964079
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2066548
> Commit-Queue: Anastasiia Nikolaienko <anastasiian@chromium.org>
> Reviewed-by: Lei Zhang <thestig@chromium.org>
> Reviewed-by: dpapad <dpapad@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#745762}

Bug: 1054394
Change-Id: Ie1a63f522f5e29b2af327010236f962836a36074
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2083317Reviewed-by: dpapad <dpapad@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Anastasiia Nikolaienko <anastasiian@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746703}