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This CL converts AudioDecoder{Ptr, Request} in media and content
to the new Mojo type, and uses pending_receiver<AudioDecoder> in
interface_factory.mojom.

Bug: 955171
Change-Id: I6a5cdc5a6c7c41be286baa8cd7235cb6adf33e41
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1864787Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Cr-Commit-Position: refs/heads/master@{#706807}