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

Bug: 955171
Change-Id: Ic346dcdeac6e2dc59dc99a953345abd61f9d2c59
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1849735
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Olga Sharonova <olka@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706946}