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This CL converts AudioFocusManagerDebug{Ptr, Request} in content
and services to the new Mojo type.

Bug: 955171
Change-Id: I9b219438be413d57b0c97e635d39b48d8a2352b6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1849734
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#704995}