Remove the supersampling AA scan-converter entirely

Android is converted, so no clients should be relying on this now.

Bug: b/40045306
Change-Id: Ibd9af21c3a06db81c8cbf091f14c998414208894
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/805518
Reviewed-by: John Stiles <johnstiles@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
8 files changed