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This simplifies many conditions around the code in
chromeos/components/tether.

Bug: 561800
Change-Id: I69c25666ae1b1362df6df67889a9a45226961387
Reviewed-on: https://chromium-review.googlesource.com/1188060Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: DongJun Kim <djmix.kim@samsung.com>
Cr-Commit-Position: refs/heads/master@{#586084}