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Note this required converting chromecast::media::{AvPipelineClient,
VideoPipelineClient,MediaPipelineClient} to be move-only, as they now
own a base::OnceClosure.


Bug: 1007649
Change-Id: I4ff9d43085cd919e939093854d1e749ce43f83e7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2340510
Commit-Queue: mark a. foltz <mfoltz@chromium.org>
Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798051}