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Previously devices would only be visible in ARCVM after a USB connect
event which didn't allow already connected devices to be visible on
startup without disconnecting and reconnecting them again.

Bug: b:123374026
Test: unit_tests --gtest_filter='*CrosUsbDetector*'
Test: Login with USB device already connected and run lsusb in Android
Change-Id: Ifc4e708f9244fb7e2fae06f2086232a282f9d8e7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1686930
Commit-Queue: Philippe Liard <pliard@google.com>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Reviewed-by: Nicholas Verne <nverne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#678560}