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We will soon be using `acorn.mjs`, which would previously throw errors
when loading, as `type="module"` enforces strict MIMEtype checking.

Bug: 1011811
Change-Id: I1eaea02f94ebf74ee8fc32678cf29dde86c25b2c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2212124
Auto-Submit: Tim van der Lippe <tvanderlippe@chromium.org>
Commit-Queue: Andrey Kosyakov <caseq@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771219}