use Make instead of Create to return a shared shader

samplecode/SampleEffects.cpp

Index: samplecode/SampleEffects.cpp
diff --git a/samplecode/SampleEffects.cpp b/samplecode/SampleEffects.cpp
index b58d5573ada59fca296d31def47686af52be2031..12ea4e23924dbd92a04a9615f7d6d67f0791b613 100644
--- a/samplecode/SampleEffects.cpp
+++ b/samplecode/SampleEffects.cpp
@@ -40,8 +40,8 @@ static void paint_proc2(SkPaint* paint) {
 static void paint_proc3(SkPaint* paint) {
     SkColor colors[] = { SK_ColorRED, COLOR, SK_ColorBLUE };
     SkPoint pts[] = { { 3, 0 }, { 7, 5 } };
-    paint->setShader(SkGradientShader::CreateLinear(pts, colors, nullptr, SK_ARRAY_COUNT(colors),
-                                        SkShader::kMirror_TileMode))->unref();
+    paint->setShader(SkGradientShader::MakeLinear(pts, colors, nullptr, SK_ARRAY_COUNT(colors),
+                                                  SkShader::kMirror_TileMode));
 }
 
 static void paint_proc5(SkPaint* paint) {