Revert of Fix to set correct output type when blending when we've read dst

include/gpu/effects/GrPorterDuffXferProcessor.h

Index: include/gpu/effects/GrPorterDuffXferProcessor.h
diff --git a/include/gpu/effects/GrPorterDuffXferProcessor.h b/include/gpu/effects/GrPorterDuffXferProcessor.h
index 695d305ae0a2d31964f7e186039974e2c9066836..26800c7f8f9387957234323f35a5b14229fc6e10 100644
--- a/include/gpu/effects/GrPorterDuffXferProcessor.h
+++ b/include/gpu/effects/GrPorterDuffXferProcessor.h
@@ -36,14 +36,6 @@
     /// @name Stage Output Types
     ////
 
-    enum PrimaryOutputType {
-        // Modulate color and coverage, write result as the color output.
-        kModulate_PrimaryOutputType,
-        // Combines the coverage, dst, and color as coverage * color + (1 - coverage) * dst. This
-        // can only be set if fDstReadKey is non-zero.
-        kCombineWithDst_PrimaryOutputType,
-    };
-
     enum SecondaryOutputType {
         // There is no secondary output
         kNone_SecondaryOutputType,
@@ -60,7 +52,6 @@
         kSecondaryOutputTypeCnt,
     };
 
-    PrimaryOutputType primaryOutputType() const { return fPrimaryOutputType; }
     SecondaryOutputType secondaryOutputType() const { return fSecondaryOutputType; }
 
     GrXferProcessor::OptFlags getOptimizations(const GrProcOptInfo& colorPOI,
@@ -86,7 +77,6 @@
         if (fSrcBlend != xp.fSrcBlend ||
             fDstBlend != xp.fDstBlend ||
             fBlendConstant != xp.fBlendConstant ||
-            fPrimaryOutputType != xp.fPrimaryOutputType || 
             fSecondaryOutputType != xp.fSecondaryOutputType) {
             return false;
         }
@@ -109,7 +99,6 @@
     GrBlendCoeff fSrcBlend;
     GrBlendCoeff fDstBlend;
     GrColor      fBlendConstant;
-    PrimaryOutputType fPrimaryOutputType;
     SecondaryOutputType fSecondaryOutputType;
 
     typedef GrXferProcessor INHERITED;