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This CL updates the DisconnectWindow class for Windows to allow it
to auto-hide after a period of inactivity (currently 10 seconds).
The dialog will then be reshown when local user activity is seen.

BUG=877176

Change-Id: Icc1e8d7db74690eac54e4084f18e1021830e0765
Reviewed-on: https://chromium-review.googlesource.com/1188597Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Commit-Queue: Joe Downing <joedow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587824}