GitLab

This CL converts MediaControllerPtr and
MediaControllerImageObserverPtr in chromeos, content and services
to the new Mojo type.

Bug: 955171
Change-Id: I319a6e0092cdc4e2c7481fd89e92abe939af147c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1849740Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Tao Wu <wutao@chromium.org>
Reviewed-by: Olga Sharonova <olka@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Cr-Commit-Position: refs/heads/master@{#705925}