Remove "death" functions from particle system

Without the "spawn another effect" binding (that was recently removed),
these serve no purpose.

Change-Id: Ica8cc3f444c6b749c634c41453501edfff9d9a23
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/356417
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
1 file changed