cros: Cleanup TODOs and update OWNERs files for WMP projects

Leaving the team so this CL cleans up a stale TODO and updates the
various OWNERs files I'm in.

Bug: none
Change-Id: I1670d0c3a0558d4a3d1db43cacb5aa72c3969e4d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3386580


Reviewed-by: Sammie Quon <sammiequon@chromium.org>
Commit-Queue: Jeremy Chinsen <chinsenj@chromium.org>
Cr-Commit-Position: refs/heads/main@{#959312}