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This feature flag gates the use of USBGuard on Chrome OS for blocking
new USB devices from being used by the linux kernel at the lockscreen.

CQ-DEPEND=CL:1154326
BUG=None
TEST=verify that dbus-send works for CrOS.
Signed-off-by: Allen Webb <allenwebb@google.com>
Change-Id: Iba101f04b1882c3dbad539bf418457129d2cdf17
Reviewed-on: https://chromium-review.googlesource.com/1161011Reviewed-by: Mattias Nissler <mnissler@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580948}