[Files app] ES6 class for multi_metadata_provider.js

Bug: 778674
Change-Id: Ib270ab8c6f7ddc916d724ae8e0d64bbce22031ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1647643
Commit-Queue: François Degros <fdegros@chromium.org>
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Auto-Submit: François Degros <fdegros@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666618}
1 file changed