[Files app] ES6 for scan_controller.js

Bug: 778674
Change-Id: Ic01d71c337c22a0f5b573e01d5525c3405aa8942
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1623647
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@{#662027}
1 file changed