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This CL applies pending_remote to AudioStreamCreatorClient argument
in ResourceProvider::CreateAudioStream. To migrate it to the new
Mojo types, this CL converts mojo::Binding to mojo::Receiver, and
mojom::AudioStreamCreatorClientPtr to mojo::PendingRemote, and so on.

Bug: 955171
Change-Id: I730fdf20fc3ffc3627bdf3f2fc12e6154554d73e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1775895Reviewed-by: Tommi <tommi@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Cr-Commit-Position: refs/heads/master@{#695439}