[skif] Remove legacy Compose implementation

Bug: skia:9282
Bug: b/263138155
Change-Id: Ib551232cdd5f962aa671130e648081e011074f39
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/721819
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Auto-Submit: Michael Ludwig <michaelludwig@google.com>
1 file changed