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/ops/GrSimpleMeshDrawOpHelperWithStencil.cpp b/src/gpu/ops/GrSimpleMeshDrawOpHelperWithStencil.cpp
index 936fb52..3c24b26 100644
--- a/src/gpu/ops/GrSimpleMeshDrawOpHelperWithStencil.cpp
+++ b/src/gpu/ops/GrSimpleMeshDrawOpHelperWithStencil.cpp
@@ -24,12 +24,10 @@
 }
 
 GrProcessorSet::Analysis GrSimpleMeshDrawOpHelperWithStencil::finalizeProcessors(
-        const GrCaps& caps, const GrAppliedClip* clip, bool hasMixedSampledCoverage,
-        GrClampType clampType, GrProcessorAnalysisCoverage geometryCoverage,
-        SkPMColor4f* geometryColor, bool* wideColor) {
+        const GrCaps& caps, const GrAppliedClip* clip, GrClampType clampType,
+        GrProcessorAnalysisCoverage geometryCoverage, SkPMColor4f* geometryColor, bool* wideColor) {
     GrProcessorAnalysisColor color = *geometryColor;
-    auto result = this->finalizeProcessors(
-            caps, clip, hasMixedSampledCoverage, clampType, geometryCoverage, &color);
+    auto result = this->finalizeProcessors(caps, clip, clampType, geometryCoverage, &color);
     color.isConstant(geometryColor);
     if (wideColor) {
         *wideColor = !geometryColor->fitsInBytes();