Migrate references of media_router::mojom::MediaController to new Mojo types

Convert both the implementation and clients in the browser and renderer
processes for the media_router.mojom.MediaController interface, and adapt
unit tests.

Bug: 955171
Change-Id: I59ab6af047fe6b87ae470e0379f7f607e12a427c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1810998
Reviewed-by: Brandon Tolsch <btolsch@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Mario Sanchez Prada <mario@igalia.com>
Cr-Commit-Position: refs/heads/master@{#699230}
25 files changed