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

src/core/SkSpriteBlitter4f.cpp

Index: src/core/SkSpriteBlitter4f.cpp
diff --git a/src/core/SkSpriteBlitter4f.cpp b/src/core/SkSpriteBlitter4f.cpp
index a13edd98064e4b54cfa5d8b13ffe2c63cce5487d..38ec7394d74f79062f6b8f70bb4fff66aaa601ba 100644
--- a/src/core/SkSpriteBlitter4f.cpp
+++ b/src/core/SkSpriteBlitter4f.cpp
@@ -13,7 +13,7 @@
 class Sprite_4f : public SkSpriteBlitter {
 public:
     Sprite_4f(const SkPixmap& src, const SkPaint& paint) : INHERITED(src) {
-        fXfer = paint.getXfermode();
+        fXfer = SkXfermode::Peek(paint.getBlendMode());
         fLoader = SkLoadSpanProc_Choose(src.info());
         fFilter = SkFilterSpanProc_Choose(paint);
         fBuffer.reset(src.width());