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When a USB memory is plugged, we currently show "Removable
device detected" notification with one button, "OPEN FILES
APP". This CL adds one more button "OPEN SETTINGS" to the
notification when ARC is enabled for the user to allow the
user to control ARC apps' USB storage access settings.

UI mock: go/filesapp-arc-extdriveaccess (page 10)

BUG=936814
TEST=browser_tests --gtest_filter='FileManagerJsTest.DeviceHandlerTest'

Change-Id: I027d70a80e678ab86de4c192556f7890dd336d71
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1585382
Commit-Queue: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659651}