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Normally, sinks are stopped when they are removed from the sink cache,
but unhealthy sinks aren't cached, so we must make sure they are
stopped before deletion.

Bug: 819277
Change-Id: I76724e21bc0f129edb03ff109b093faecfa04861
Reviewed-on: https://chromium-review.googlesource.com/962124
Commit-Queue: Max Morin <maxmorin@chromium.org>
Reviewed-by: Olga Sharonova <olka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543068}