Delete non-raster-pipeline SkTwoPointConicalGradient impl

Change-Id: If39a2b01d6099fef14695a4ce05b57a3d5c3d99c
Reviewed-on: https://skia-review.googlesource.com/21320
Reviewed-by: Mike Reed <reed@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>
3 files changed