Remove (unused) shader caps from default GP factory functions

Change-Id: Id3313169be2fecfb8a11045f08a55490fbec9b9e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/276486
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
14 files changed