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This is a reland of 9d2bdda8

Original change's description:
> [Files app] Generate modules for ui/file_manager/.../metadata_proxy.js
>
> Converted files:
> - ui/file_manager/file_manager/background/js/metadata_proxy.js
> - ui/file_manager/file_manager/background/js/metadata_proxy_unittest.js
>
> Bug: 1133186
> Change-Id: I81eb9d34fff12835ef5974acfee3817fec864340
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2563105
> Commit-Queue: Jeremie Boulic <jboulic@chromium.org>
> Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#833130}

Bug: 1133186
Change-Id: Idee34300befe5605219967ee7cea0ed803f4aeda
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2573699Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Auto-Submit: Jeremie Boulic <jboulic@chromium.org>
Commit-Queue: Jeremie Boulic <jboulic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833622}