Use SkXfermode as public facing enum for GrPorterDuffXP

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 1bd199370e2a22c27b1ea5a89821ccb7537d1d03..0d3b01ff4d4d9184ab46f80669d24198924e2e19 100644
--- a/include/gpu/effects/GrPorterDuffXferProcessor.h
+++ b/include/gpu/effects/GrPorterDuffXferProcessor.h
@@ -18,14 +18,6 @@ class GrPorterDuffXPFactory : public GrXPFactory {
 public:
     static GrXPFactory* Create(SkXfermode::Mode mode); 
 
-    static GrXPFactory* Create(SkXfermode::Coeff src, SkXfermode::Coeff dst) {
-        return SkNEW_ARGS(GrPorterDuffXPFactory, ((GrBlendCoeff)(src), (GrBlendCoeff)(dst)));
-    }
-
-    static GrXPFactory* Create(GrBlendCoeff src, GrBlendCoeff dst) {
-        return SkNEW_ARGS(GrPorterDuffXPFactory, (src, dst));
-    }
-
     bool supportsRGBCoverage(GrColor knownColor, uint32_t knownColorFlags) const SK_OVERRIDE;
 
     bool canApplyCoverage(const GrProcOptInfo& colorPOI,