remove avoid and pixelxor xfermodes

gyp/effects.gypi

Index: gyp/effects.gypi
diff --git a/gyp/effects.gypi b/gyp/effects.gypi
index cfbae453e226c9ebb42b7ea20b042bd6567f8575..24bfaf60ad4cf8b07acf756e1639d7cdd2510e9c 100644
--- a/gyp/effects.gypi
+++ b/gyp/effects.gypi
@@ -21,7 +21,6 @@
     '<(skia_src_path)/effects/SkArithmeticMode.cpp',
     '<(skia_src_path)/effects/SkArithmeticMode_gpu.cpp',
     '<(skia_src_path)/effects/SkArithmeticMode_gpu.h',
-    '<(skia_src_path)/effects/SkAvoidXfermode.cpp',
     '<(skia_src_path)/effects/SkBlurDrawLooper.cpp',
     '<(skia_src_path)/effects/SkBlurMask.cpp',
     '<(skia_src_path)/effects/SkBlurMask.h',
@@ -59,7 +58,6 @@
     '<(skia_src_path)/effects/SkPaintImageFilter.cpp',
     '<(skia_src_path)/effects/SkPerlinNoiseShader.cpp',
     '<(skia_src_path)/effects/SkPictureImageFilter.cpp',
-    '<(skia_src_path)/effects/SkPixelXorXfermode.cpp',
     '<(skia_src_path)/effects/SkTableColorFilter.cpp',
     '<(skia_src_path)/effects/SkTableMaskFilter.cpp',
     '<(skia_src_path)/effects/SkTestImageFilters.cpp',
@@ -121,8 +119,5 @@
     '<(skia_include_path)/effects/SkTableMaskFilter.h',
     '<(skia_include_path)/effects/SkTileImageFilter.h',
     '<(skia_include_path)/effects/SkXfermodeImageFilter.h',
-
-    '<(skia_include_path)/client/android/SkAvoidXfermode.h',
-    '<(skia_include_path)/client/android/SkPixelXorXfermode.h',
   ],
 }