Replace mask blur FPs with GrSkSLFP

Change-Id: Ie257eca4357b7ab66845af046329ad89857cdaa5
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/423025
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
diff --git a/src/gpu/GrProcessorUnitTest.cpp b/src/gpu/GrProcessorUnitTest.cpp
index 3df9cea..3a6f0d1 100644
--- a/src/gpu/GrProcessorUnitTest.cpp
+++ b/src/gpu/GrProcessorUnitTest.cpp
@@ -146,7 +146,7 @@
  * we verify the count is as expected.  If a new factory is added, then these numbers must be
  * manually adjusted.
  */
-static constexpr int kFPFactoryCount = 21;
+static constexpr int kFPFactoryCount = 18;
 static constexpr int kGPFactoryCount = 14;
 static constexpr int kXPFactoryCount = 4;