Remove DSL from GrConvexPolyEffect.

Ganesh didn't adopt DSL for its fragment processors, except for two.
Backing out those two will allow us to eliminate a lot of unused tech.

Change-Id: I705072fe589746d05e0ae54ef25cee4de368f9b5
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/540318
Reviewed-by: Brian Osman <brianosman@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
2 files changed