Remove flexible runtime effects entirely

All internal usage has migrated to MakeFor..., this removes the old
program kind, and updates some tests.

Bug: skia:11813
Change-Id: I56733b071270e1ae3fab5d851e23acf6c02e3361
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/402536
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: John Stiles <johnstiles@google.com>
diff --git a/src/sksl/SkSLProgramSettings.h b/src/sksl/SkSLProgramSettings.h
index 3396ef7..427e63f 100644
--- a/src/sksl/SkSLProgramSettings.h
+++ b/src/sksl/SkSLProgramSettings.h
@@ -78,8 +78,7 @@
 
     bool strictES2Mode() const {
         return fSettings.fEnforceES2Restrictions &&
-               (fKind == ProgramKind::kRuntimeEffect ||
-                fKind == ProgramKind::kRuntimeColorFilter ||
+               (fKind == ProgramKind::kRuntimeColorFilter ||
                 fKind == ProgramKind::kRuntimeShader ||
                 fKind == ProgramKind::kGeneric);
     }