Replace `is_chromecast` with `is_castos` and `is_cast_android` as
appropriate. See linked bug for further context.
Bug: chromium:1219802
Change-Id: If24af59e058940b7259cf4f1d9a3ba2ee0449cdb
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/265601
Reviewed-by: Henrik Andreassson <henrika@webrtc.org>
Reviewed-by: David Dorwin <ddorwin@google.com>
Reviewed-by: Mark Foltz <mfoltz@chromium.org>
Commit-Queue: Ryan Keane <rwkeane@google.com>
Cr-Commit-Position: refs/heads/main@{#37230}
cf7802d3f4