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This CL fixes two issues:
* Fix do-not-disturb button to turn on DND automatically on the label
  click.
* Fix network button to ignore the icon click when Ethernet is
  connected.

TEST=manual
BUG=859831,861709

Change-Id: I064db9687084ac21aa9a059b7cd90f740e734d4d
Reviewed-on: https://chromium-review.googlesource.com/1139849
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575957}