remove avoid and pixelxor xfermodes

src/ports/SkGlobalInitialization_default.cpp

Index: src/ports/SkGlobalInitialization_default.cpp
diff --git a/src/ports/SkGlobalInitialization_default.cpp b/src/ports/SkGlobalInitialization_default.cpp
index 8b27c49a6ef327d634f1066c55f67c2c1bf28ef5..ed0f47461789cd080ba4a8b4cc1300e1fe58696f 100644
--- a/src/ports/SkGlobalInitialization_default.cpp
+++ b/src/ports/SkGlobalInitialization_default.cpp
@@ -10,7 +10,6 @@
 #include "SkAlphaThresholdFilter.h"
 #include "SkArithmeticMode.h"
 #include "SkArcToPathEffect.h"
-#include "SkAvoidXfermode.h"
 #include "SkBitmapSourceDeserializer.h"
 #include "SkBlurDrawLooper.h"
 #include "SkBlurImageFilter.h"
@@ -40,7 +39,6 @@
 #include "SkPaintImageFilter.h"
 #include "SkPerlinNoiseShader.h"
 #include "SkPictureImageFilter.h"
-#include "SkPixelXorXfermode.h"
 #include "SkTableColorFilter.h"
 #include "SkTestImageFilters.h"
 #include "SkTileImageFilter.h"
@@ -90,10 +88,6 @@ void SkFlattenable::PrivateInitializer::InitEffects() {
     SkGradientShader::InitializeFlattenables();
     SkLightingShader::InitializeFlattenables();
 
-    // Xfermode
-    SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkPixelXorXfermode)
-    SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkAvoidXfermode)
-
     // PathEffect
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkArcToPathEffect)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkCornerPathEffect)