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This CL converts AudioFocusManager{Ptr, Request} in chrome,
components, content and services to the new Mojo type, and uses
pending_remote<AudioFocusManager> in media_session.mojom.

Bug: 955171
Change-Id: If94cf50ca0e051f4e0864fa5efd01e3595e70205
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1849732Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Cr-Commit-Position: refs/heads/master@{#704942}