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Convert both the implementation and clients in the browser and renderer
processes for the media.mojom.AudioOutputStreamProviderClient interface,
and adapt unit tests.

Bug: 955171
Change-Id: I8791ab3d52f134d7ec29ea9703709641e40edc16
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1803286
Commit-Queue: Mario Sanchez Prada <mario@igalia.com>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Reviewed-by: Tommi <tommi@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698426}