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Now that the mirroring service has launched, the deprecated
MirrorServiceRemoter and MirrorServiceRemotingSource interfaces can be
removed. This patch removes these interfaces and associated usages, and
adds a new failure reason for remoting start failures.

Bug: 1015486
Change-Id: I65f68487acc92afd45402b193be51225592c2cf2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2265456Reviewed-by: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Mike Pinkerton <pinkerton@chromium.org>
Reviewed-by: Brandon Tolsch <btolsch@chromium.org>
Commit-Queue: Jordan Bayles <jophba@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784525}