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In linux-chromeos, $HOME/Downloads rather than profile_path is used as
the FilesApp MyFiles directory, and currently these files cannot be
opened in a browser since they are not within the allowed paths.

https://source.chromium.org/chromium/chromium/src/+/master:chrome/browser/chromeos/file_manager/path_util.cc;l=247-249;drc=c2dbbeb2f40590e1696e6c853f9e814404be6471

Since linux-chromeos is a testing-only system, we can allow any paths to
be accessed which is helpful for testing such as the current drag and
drop work I am doing.

Bug: 1144138
Change-Id: I34253192270c982bd54c0d1bba33bd81e3532042
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2531073Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826524}