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This CL changes Audio Player background page to run as JS module.

Bug: 1133186
Change-Id: Ib9657c09bcea95deb97e63d19bfdfac88644daeb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537287Reviewed-by: Jeremie Boulic <jboulic@chromium.org>
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Auto-Submit: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827996}