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Reland of CL:2503909, I've tested locally as described in
crbug.com/1144470#c3 and it's fixed. The change to fix is here:
https://chromium-review.googlesource.com/c/chromium/src/+/2519177/2..3

Add a new PAK file for resources in Files app and companion apps like
Audio Player, to host the generated JS modules.

Change ChromeComponentExtensionResourceManager to also load the
resources from this new PAK file.  This was refactored to not depend on
file_manager_resource_util.h any longer, which allowed to remove this
util.

Rename Audio Player optimize_webu() to "build" to follow the convention.

This is a preparation for converting these apps to JS modules.

Bug: 1133186, 1030998, 1144470
Change-Id: Ic803e5f071cde0ac31713578a6f17e74a07c5465
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2519177Reviewed-by: Jeremie Boulic <jboulic@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825256}