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Migrates device service code and tests from deprecated service APIs to
new ones. Namely this phases out its use of ServiceContext and
ServiceTest in favor of ServiceBinding and plain old unit tests.

Bug: 891780,906239
Change-Id: I7677134b5d11e7297b162bbb532dfabb810504d2
Reviewed-on: https://chromium-review.googlesource.com/c/1345124
Commit-Queue: Ken Rockot <rockot@google.com>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611379}