switch patheffects over to sk_sp

gm/dashcircle.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 "SkPath.h"
 #include "SkDashPathEffect.h"
@@ skipping 50 matching lines @@
             SkPaint p;
             p.setAntiAlias(true);
             p.setStyle(SkPaint::kStroke_Style);
             p.setStrokeWidth(10);
             SkScalar intervals[4];
             int intervalCount = dashExample.length;
             SkScalar dashLength = circumference / wedge / dashUnits;
             for (int index = 0; index < dashExample.length; ++index) {
                 intervals[index] = dashExample.pattern[index] * dashLength;
             }
-            p.setPathEffect(SkDashPathEffect::Create(intervals, intervalCount, 0))->unref();
+            p.setPathEffect(SkDashPathEffect::Make(intervals, intervalCount, 0));
             canvas->drawPath(circle, p);
             canvas->translate(0, radius * 2 + 50);
         }
         canvas->restore();
         canvas->translate(radius * 2  + 50, 0);
     }
 }