switch xfermodes over to sk_sp

gm/avoidxfermode2.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gm.h"
 #include "SkAvoidXfermode.h"
 
@@ skipping 17 matching lines @@
         p0.setColor(SK_ColorGREEN);
         p0.setAntiAlias(false);
 
         canvas->drawRect(r, p0);
 
         r = SkRect::MakeIWH(64, 64);
 
         // UL corner: replace the green with a tight tolerance
         SkPaint p1;
         p1.setColor(SK_ColorRED);
-        p1.setXfermode(SkAvoidXfermode::Create(SK_ColorGREEN,
-                                               55,
-                                               SkAvoidXfermode::kTargetColor_Mode))->unref();
+        p1.setXfermode(SkAvoidXfermode::Make(SK_ColorGREEN, 55,
+                                             SkAvoidXfermode::kTargetColor_Mode));
 
         canvas->drawRect(r, p1);
 
         r.offsetTo(64, 0.0f);
 
         // UR corner: avoid the green with a tight tolerance
         SkPaint p2;
         p2.setColor(SK_ColorRED);
-        p2.setXfermode(SkAvoidXfermode::Create(SK_ColorGREEN,
-                                               200,
-                                               SkAvoidXfermode::kAvoidColor_Mode))->unref();
+        p2.setXfermode(SkAvoidXfermode::Make(SK_ColorGREEN, 200,
+                                             SkAvoidXfermode::kAvoidColor_Mode));
 
         canvas->drawRect(r, p2);
 
         r.offsetTo(0.0f, 64);
 
         // LL corner: replace the green with a loose tolerance
         SkPaint p3;
         p3.setColor(SK_ColorRED);
-        p3.setXfermode(SkAvoidXfermode::Create(SK_ColorGREEN,
-                                               200,
-                                               SkAvoidXfermode::kTargetColor_Mode))->unref();
+        p3.setXfermode(SkAvoidXfermode::Make(SK_ColorGREEN, 200,
+                                             SkAvoidXfermode::kTargetColor_Mode));
 
         canvas->drawRect(r, p3);
 
         r.offsetTo(64, 64);
 
         // LR corner: avoid the green with a loose tolerance
         SkPaint p4;
         p4.setColor(SK_ColorRED);
-        p4.setXfermode(SkAvoidXfermode::Create(SK_ColorGREEN,
-                                               55,
-                                               SkAvoidXfermode::kAvoidColor_Mode))->unref();
+        p4.setXfermode(SkAvoidXfermode::Make(SK_ColorGREEN, 55, SkAvoidXfermode::kAvoidColor_Mode));
 
         canvas->drawRect(r, p4);
     }
 
 private:
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 DEF_GM(return new AvoidXfermode2GM;)