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This CL converts AudioLog{Ptr, Request} in content and services to
the new Mojo type, and usese pending_receiver<AudioLog> in
audio_logging.mojom.

Bug: 955171
Change-Id: I34ac38228c93723dc258f87c36aa2938d4d7bc1b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1872090
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Olga Sharonova <olka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709010}