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This remedies the following situation:
  (1) Host scan discovers a potential Tether host device.
  (2) User visits the "internet detail page", which displays information
      about that Tether host.
  (2b - optional) User opens the tether confirmation dialog.
  (3) A subsequent host scan can no longer find the device.
  (4) User can no longer connect to the device, but has no idea why.

This CL places a warning in red text on both the internet detail page
and the tether confirmation dialog when this situation occurs. Likewise,
this CL also adds a warning in the detail page for Wi-Fi networks which
have gone out of range.

Bug: 750955, 672263
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I75666e25a0df0add94ea469599641b0703b64d76
Reviewed-on: https://chromium-review.googlesource.com/818465
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523496}