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This CL converts AudioInputStream{Ptr, Request} in chrome,
components, content, media and services to the new Mojo type, and
uses pending_remote<AudioDecoderClient> in resource_provider.mojom
and renderer_audio_input_stream_factory.mojom.

Bug: 955171
Change-Id: I84dc6af48103eb289bb2db097037f99c17e0119c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1864660Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Cr-Commit-Position: refs/heads/master@{#708562}