GitLab

Changes the /crostini/shared_usb_devices page in crostini settings to
more closely match /crostini/shared_paths and other settings UI.

Bug: 930588
Change-Id: I14ec8a58ce4b263520efbdcd317281a30de3d2ad
Reviewed-on: https://chromium-review.googlesource.com/c/1477569
Commit-Queue: Josh Pratt <jopra@chromium.org>
Reviewed-by: Nicholas Verne <nverne@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635903}