JS clang format ui/file_manager/file_manager/background/

Bug: 778674
Change-Id: Ib7c1baa98135cab762dd43cd8da7bccbfadd87c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1528024
Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Auto-Submit: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#641805}
32 files changed