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USB detach event not delivered to Arc container

After usb_service called OnDeviceRemoved(), query usb_service for this
device will not(gurantee) return any result.

Use the scoped_refptr passed by OnDeviceRemoved directly and deliver the
detach event to ARC container.

Bug: 853353
Test: Manual
Change-Id: I74214b455a678548c3a80eebf214fdfa5beced99
Reviewed-on: https://chromium-review.googlesource.com/1103284
Commit-Queue: Long Cheng <lgcheng@google.com>
Reviewed-by: Luis Hector Chavez <lhchavez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568232}