Reland of "more shader-->sp conversions (patchset #5 id:80001 of https://codereview.chromium…

gm/imagetoyuvplanes.cpp

Index: gm/imagetoyuvplanes.cpp
diff --git a/gm/imagetoyuvplanes.cpp b/gm/imagetoyuvplanes.cpp
index 09b3dbb98b92240a43989a91f9eabcab40b4a78a..87bff8ee64948c241d3737aa927db62c0224d41e 100644
--- a/gm/imagetoyuvplanes.cpp
+++ b/gm/imagetoyuvplanes.cpp
@@ -28,9 +28,9 @@ static SkImage* create_image(GrContext* context, int width, int height) {
     static const SkColor kColors[] =
             { SK_ColorBLUE, SK_ColorYELLOW, SK_ColorGREEN, SK_ColorWHITE };
     SkScalar r = (width + height) / 4.f;
-    paint.setShader(SkGradientShader::CreateRadial(SkPoint::Make(0,0), r, kColors,
-                                                   nullptr, SK_ARRAY_COUNT(kColors),
-                                                   SkShader::kMirror_TileMode))->unref();
+    paint.setShader(SkGradientShader::MakeRadial(SkPoint::Make(0,0), r, kColors,
+                                                 nullptr, SK_ARRAY_COUNT(kColors),
+                                                 SkShader::kMirror_TileMode));
 
     surface->getCanvas()->drawPaint(paint);
     return surface->newImageSnapshot();