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If a USB device is already assigned to a VM and another requests to
attach it, we show a confirmation dialog.

https://storage.cloud.google.com/chromium-translation-screenshots/e35f1ed0b95833f5b1417ab90fe568efed19a1c2

Bug: 1129266
Change-Id: I08692dcc29db82cb0e15f8e3acc391a86f3684ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2415913
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Regan Hsu <hsuregan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808186}