more shader-->sp conversions

gm/verylargebitmap.cpp

Index: gm/verylargebitmap.cpp
diff --git a/gm/verylargebitmap.cpp b/gm/verylargebitmap.cpp
index 5c67e77e3e99eef57c35ccf386266125e822ef2d..ab6821dc1abc651b01b40e57a9075a3afcb11145 100644
--- a/gm/verylargebitmap.cpp
+++ b/gm/verylargebitmap.cpp
@@ -15,10 +15,9 @@
 static void draw(SkCanvas* canvas, int width, int height, SkColor colors[2]) {
     const SkPoint center = { SkIntToScalar(width)/2, SkIntToScalar(height)/2 };
     const SkScalar radius = 40;
-    SkShader* shader = SkGradientShader::CreateRadial(center, radius, colors, nullptr, 2,
-                                                      SkShader::kMirror_TileMode);
     SkPaint paint;
-    paint.setShader(shader)->unref();
+    paint.setShader(SkGradientShader::MakeRadial(center, radius, colors, nullptr, 2,
+                                                 SkShader::kMirror_TileMode));
     paint.setXfermodeMode(SkXfermode::kSrc_Mode);
     canvas->drawPaint(paint);
 }