remove unused code around SK_SUPPORT_LEGACY_XFERMODE_PARAM

BUG=skia:

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4384

Change-Id: I5121acd027d935ade169ff65941f29f654a47bd0
Reviewed-on: https://skia-review.googlesource.com/4384
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/src/core/SkPictureRecord.h b/src/core/SkPictureRecord.h
index 0db9b8b..ca858a6 100644
--- a/src/core/SkPictureRecord.h
+++ b/src/core/SkPictureRecord.h
@@ -178,10 +178,9 @@
                                 const SkPaint& paint) override;
 
     void onDrawPatch(const SkPoint cubics[12], const SkColor colors[4],
-                             const SkPoint texCoords[4], SK_XFERMODE_PARAM xmode,
-                             const SkPaint& paint) override;
+                     const SkPoint texCoords[4], SkBlendMode, const SkPaint& paint) override;
     void onDrawAtlas(const SkImage*, const SkRSXform[], const SkRect[], const SkColor[], int,
-                     SK_XFERMODE_MODE_PARAM, const SkRect*, const SkPaint*) override;
+                     SkBlendMode, const SkRect*, const SkPaint*) override;
 
     void onDrawPaint(const SkPaint&) override;
     void onDrawPoints(PointMode, size_t count, const SkPoint pts[], const SkPaint&) override;
@@ -201,7 +200,7 @@
 
     void onDrawVertices(VertexMode vmode, int vertexCount,
                         const SkPoint vertices[], const SkPoint texs[],
-                        const SkColor colors[], SK_XFERMODE_PARAM xmode,
+                        const SkColor colors[], SkBlendMode,
                         const uint16_t indices[], int indexCount,
                         const SkPaint&) override;