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Migrate these legacy IPC message to the media.mojom.MediaPlayerObserver
mojo interface, implemented by MediaSessionController in the browser
process, and update their callers in the renderer process.

This CL migrates these messages together to simplify the review process
by avoiding unnecessary cycles, since the way they both get migrated is
nearly identical.

Relevant design document:
https://docs.google.com/document/d/1OLMNxLvGkRO6ju_WfHbRMrgaVnW7bsMnW7XlJQI0A2E

Bug: 1039252
Change-Id: I2e05e9fc39f17f3875fadcbaf65a28eff5170be0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2560621
Commit-Queue: Mario Sanchez Prada <mario@igalia.com>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Reviewed-by: Becca Hughes <beccahughes@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835683}