Update some more areas in cast_core to make it V30 protocol ompatible

Tested: n/a - mostly a port of what was updated internally
Bug: 397699183
Change-Id: Ie68bd2993baa4ca42168a2876f749a6e0bca66fe
Reviewed-on: https://chromium-review.googlesource.com/c/cast_core/public/+/6377546
Reviewed-by: Shawn Quereshi <shawnq@google.com>
Tested-by: Shawn Quereshi <shawnq@google.com>