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Now, when RegisterAdvertisement() or Unregister() fail, the operation is
retried until it succeeds. This fixes several related issues which
result from getting stuck thinking that an advertisement is registered
or unregistered when it actually is not.

Bug: 767500, 672263
Change-Id: I73886e104dc64fbc3f307e3c834de873ddf85914
Reviewed-on: https://chromium-review.googlesource.com/677715Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#503626}