switch xfermodes over to sk_sp

gm/blurredclippedcircle.cpp

 /*
  * Copyright 2015 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 "SkBlurMaskFilter.h"
 #include "SkColorFilter.h"
@@ skipping 16 matching lines @@
         return SkString("blurredclippedcircle");
     }
 
     SkISize onISize() override {
         return SkISize::Make(kWidth, kHeight);
     }
 
     void onDraw(SkCanvas* canvas) override {
         SkPaint whitePaint;
         whitePaint.setColor(SK_ColorWHITE);
-        whitePaint.setXfermode(SkXfermode::Create(SkXfermode::kSrc_Mode))->unref();
+        whitePaint.setXfermode(SkXfermode::Make(SkXfermode::kSrc_Mode));
         whitePaint.setAntiAlias(true);
 
         // This scale exercises precision limits in the circle blur effect (crbug.com/560651)
         static const float kScale = 2.0f;
         canvas->scale(kScale, kScale);
 
         canvas->save();
             SkRect clipRect1 = SkRect::MakeLTRB(0, 0,
                                                 SkIntToScalar(kWidth), SkIntToScalar(kHeight));
 
@@ skipping 35 matching lines @@
     static const int kWidth = 1164;
     static const int kHeight = 802;
 
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 DEF_GM(return new BlurredClippedCircleGM;)
 }