switch xfermodes over to sk_sp

waiting on https://codereview.chromium.org/1835163002/

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1832223002

Review URL: https://codereview.chromium.org/1832223002
diff --git a/src/core/SkBitmapProcShader.cpp b/src/core/SkBitmapProcShader.cpp
index 0a3c0ea..14114c0 100644
--- a/src/core/SkBitmapProcShader.cpp
+++ b/src/core/SkBitmapProcShader.cpp
@@ -132,7 +132,7 @@
         // To implement the old shadeSpan entry-point, we need to efficiently convert our native
         // floats into SkPMColor. The SkXfermode::D32Procs do exactly that.
         //
-        sk_sp<SkXfermode> xfer(SkXfermode::Create(SkXfermode::kSrc_Mode));
+        sk_sp<SkXfermode> xfer(SkXfermode::Make(SkXfermode::kSrc_Mode));
         fXferProc = SkXfermode::GetD32Proc(xfer.get(), 0);
     }