[Files app] ES6 for file_manager_commands.js

Bug: 778674
Change-Id: I5cccfce4c51478717626a3368b4df5731ae0c2cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1628492
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Auto-Submit: Fran├žois Degros <fdegros@chromium.org>
Cr-Commit-Position: refs/heads/master@{#663448}
1 file changed