Hide SkPixelXorXfermode from Chrome

src/effects/SkToFromValue.cpp

Index: src/effects/SkToFromValue.cpp
diff --git a/src/effects/SkToFromValue.cpp b/src/effects/SkToFromValue.cpp
index cbb265b33fa244530ad8a9fa18ebbb8ab7f1e62b..9bc46019877e6df00ac940c44cc0ca817a940b48 100644
--- a/src/effects/SkToFromValue.cpp
+++ b/src/effects/SkToFromValue.cpp
@@ -88,6 +88,8 @@ static bool from_value_ArithmeticXfermode(const SkValue& val,
     return true;
 }
 
+#if SK_INCLUDE_DEPRECATED_XFERMODES
+
 static bool from_value_PixelXorXfermode(const SkValue& val,
                                         SkAutoTUnref<SkXfermode>* dst) {
     uint32_t opColor;
@@ -96,6 +98,8 @@ static bool from_value_PixelXorXfermode(const SkValue& val,
     return true;
 }
 
+#endif
+
 static bool from_value_ProcCoeffXfermode(const SkValue& val,
                                          SkAutoTUnref<SkXfermode>* dst) {
     uint32_t mode;
@@ -109,7 +113,9 @@ template<> bool SkFromValue< SkAutoTUnref<SkXfermode> >(
     switch (val.type()) {
         case SkValue::DefaultXfermode:    return from_value_DefaultXfermode(val, dst);
         case SkValue::ArithmeticXfermode: return from_value_ArithmeticXfermode(val, dst);
+#if SK_INCLUDE_DEPRECATED_XFERMODES
         case SkValue::PixelXorXfermode:   return from_value_PixelXorXfermode(val, dst);
+#endif
         case SkValue::ProcCoeffXfermode:  return from_value_ProcCoeffXfermode(val, dst);
         default:                          REQUIRE(false);
     }