Remove remaining "Gr" references outside of #ifdefs from tessellators

Bug: skia:12524
Change-Id: I2fb523495cfa72591a14b4ef03d32e3aad06fcf2
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/474396
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
14 files changed