use Make instead of Create to return a shared shader

samplecode/Sample2PtRadial.cpp

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SampleCode.h"
 #include "SkView.h"
 #include "SkCanvas.h"
@@ skipping 15 matching lines @@
     }
 
     virtual void onDrawContent(SkCanvas* canvas) {
         canvas->translate(SkIntToScalar(10), SkIntToScalar(20));
 
         SkColor colors[] = { SK_ColorRED, SK_ColorBLUE };
         SkPoint c0 = { 0, 0 };
         SkScalar r0 = 100;
         SkPoint c1 = { 100, 100 };
         SkScalar r1 = 100;
-        SkShader* s = SkGradientShader::CreateTwoPointConical(c0, r0, c1, r1, colors,
+        SkPaint paint;
+        paint.setShader(SkGradientShader::MakeTwoPointConical(c0, r0, c1, r1, colors,
                                                              nullptr, 2,
-                                                             SkShader::kClamp_TileMode);
-
-        SkPaint paint;
-        paint.setShader(s)->unref();
+                                                             SkShader::kClamp_TileMode));
         canvas->drawPaint(paint);
     }
 
 private:
     typedef SampleView INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static SkView* MyFactory() { return new TwoPtConicalView; }
 static SkViewRegister reg(MyFactory);