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Currently, successfully starting/stopping/starting RemotePlayback runs
into a DCHECK, because we never properly clean up on RemotePlayback
stop. This CL fixes the issue and gets rid of a TODO.

Bug: 790766
Change-Id: Ieca32cd175741e5c1ae7e55879ae4a224d67b76c
Reviewed-on: https://chromium-review.googlesource.com/c/1260282Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: Thomas Guilbert <tguilbert@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596435}