Revert[8] "replace SkXfermode obj with SkBlendMode enum in paints"

This reverts commit c245574ba3d0e2ade6c94b2812de3baa383bf4c4.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2396953002

TBR=

Review-Url: https://codereview.chromium.org/2396953002
diff --git a/src/effects/SkMorphologyImageFilter.cpp b/src/effects/SkMorphologyImageFilter.cpp
index 82e47c5..2bd7928 100644
--- a/src/effects/SkMorphologyImageFilter.cpp
+++ b/src/effects/SkMorphologyImageFilter.cpp
@@ -401,7 +401,7 @@
                                                              radius,
                                                              morphType,
                                                              bounds));
-    paint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
+    paint.setPorterDuffXPFactory(SkBlendMode::kSrc);
     drawContext->fillRectToRect(clip, paint, SkMatrix::I(), SkRect::Make(dstRect),
                                      SkRect::Make(srcRect));
 }
@@ -418,7 +418,7 @@
     paint.setGammaCorrect(drawContext->isGammaCorrect());
     paint.addColorFragmentProcessor(GrMorphologyEffect::Make(texture, direction, radius,
                                                              morphType));
-    paint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
+    paint.setPorterDuffXPFactory(SkBlendMode::kSrc);
     drawContext->fillRectToRect(clip, paint, SkMatrix::I(), SkRect::Make(dstRect),
                                 SkRect::Make(srcRect));
 }