GitLab

[CrOS Tether] Show the "connection to host failed" notification when a Tether connection attempt fails.

The notification is removed when it is clicked or when a new connection attempt
is started.

Bug: 672263, 734241
Change-Id: I985554345796b953c166024e4bcddf141703591f
Reviewed-on: https://chromium-review.googlesource.com/575526Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Commit-Queue: Ryan Hansberry <hansberry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487312}