switch patheffects over to sk_sp

gm/pathcontourstart.cpp

Index: gm/pathcontourstart.cpp
diff --git a/gm/pathcontourstart.cpp b/gm/pathcontourstart.cpp
index de3644c9f195ef6ed7d8f5b087bdb8565dfdf06a..dbda7c3caef3a494c8f10e1193b2963468fbdc2e 100644
--- a/gm/pathcontourstart.cpp
+++ b/gm/pathcontourstart.cpp
@@ -26,14 +26,11 @@ public:
             intervals.push_back(len);
         }
 
-        SkAutoTUnref<SkPathEffect> effect(
-            SkDashPathEffect::Create(intervals.begin(), intervals.count(), 0));
-
         fDashPaint.setAntiAlias(true);
         fDashPaint.setStyle(SkPaint::kStroke_Style);
         fDashPaint.setStrokeWidth(6);
         fDashPaint.setColor(0xff008000);
-        fDashPaint.setPathEffect(effect);
+        fDashPaint.setPathEffect(SkDashPathEffect::Make(intervals.begin(), intervals.count(), 0));
 
         fPointsPaint.setColor(0xff800000);
         fPointsPaint.setStrokeWidth(3);