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This behavior causes the attached bug where serial devices get detached
from the host. This behavior isn't going to work in general as unclaimed
devices on ChromeOS are still claimable through webusb for example.

This means that devices should get attached to ARCVM on demand/user
decision rather than on connection.

BUG=1763558, b:123374026
TEST=CrosUsbDetectorTest

Change-Id: I3aa40bfb08bb2ce61ddb6c3ff47efffe0781b728
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1772783Reviewed-by: Nicholas Verne <nverne@chromium.org>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Auto-Submit: Philippe Liard <pliard@google.com>
Commit-Queue: Philippe Liard <pliard@google.com>
Cr-Commit-Position: refs/heads/master@{#693026}