Delete mixed samples

Mixed samples is no longer relevant for Ganesh. DMSAA and the new
Ganesh architecture both rely on full MSAA, and any platform where
mixed samples is supported will ultimately not use the old
architecture.

Change-Id: I5acc745010e090ef26310d92ec6240be2cd494cf
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/399837
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
diff --git a/src/gpu/tessellate/GrStrokeTessellateOp.h b/src/gpu/tessellate/GrStrokeTessellateOp.h
index 33f521b..bb2724f 100644
--- a/src/gpu/tessellate/GrStrokeTessellateOp.h
+++ b/src/gpu/tessellate/GrStrokeTessellateOp.h
@@ -54,8 +54,7 @@
     const char* name() const override { return "GrStrokeTessellateOp"; }
     void visitProxies(const VisitProxyFunc& fn) const override;
     FixedFunctionFlags fixedFunctionFlags() const override;
-    GrProcessorSet::Analysis finalize(const GrCaps&, const GrAppliedClip*,
-                                      bool hasMixedSampledCoverage, GrClampType) override;
+    GrProcessorSet::Analysis finalize(const GrCaps&, const GrAppliedClip*, GrClampType) override;
     CombineResult onCombineIfPossible(GrOp*, SkArenaAlloc*, const GrCaps&) override;
 
     // Creates the tessellator and the stencil/fill program(s) we will use with it.