DR-161 made `experimentalNativeVideo` default to on, but three comments still
described the pre-flip world and one of them was load-bearing:
- `nativeVideo.ts` labelled the store "Default off" directly above a `load()`
that returns true when nothing is stored.
- The two PiP comments explained themselves as "what makes PiP work in the
shipping configuration", which stopped being true when Android started
shrinking the real ExoPlayer surface. They still describe the Linux path and
the flag-off case, so they say that instead.
- `video_audio_codecs` justified its narrow codec list with "video does not play
through ExoPlayer", which is no longer so on Android. The narrow list is still
right, for a different reason now recorded: the flag is a user setting and a
download outlives it, so only the intersection holds on both sides of the
switch. DR-171 carries the same caveat.
No behaviour change.
dtourolle
7387f35c7e