partial switch over to sp usage of shaders

gm/colormatrix.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 "gm.h"
 #include "SkColorMatrixFilter.h"
 #include "SkGradientShader.h"
@@ skipping 49 matching lines @@
     // creates a bitmap with shades of transparent gray.
     static SkImage* CreateTransparentBitmap(int width, int height) {
         SkBitmap bm;
         bm.allocN32Pixels(width, height);
         SkCanvas canvas(bm);
         canvas.clear(0x0);
 
         SkPoint pts[] = {{0, 0}, {SkIntToScalar(width), SkIntToScalar(height)}};
         SkColor colors[] = {0x00000000, 0xFFFFFFFF};
         SkPaint paint;
-        paint.setShader(SkGradientShader::CreateLinear(pts, colors, nullptr, 2,
-                                                       SkShader::kClamp_TileMode))->unref();
+        paint.setShader(SkGradientShader::MakeLinear(pts, colors, nullptr, 2,
+                                                     SkShader::kClamp_TileMode));
         canvas.drawRect(SkRect::MakeWH(SkIntToScalar(width), SkIntToScalar(height)), paint);
         return SkImage::NewFromBitmap(bm);
     }
 
     void onDraw(SkCanvas* canvas) override {
         SkPaint paint;
         SkColorMatrix matrix;
 
         paint.setXfermodeMode(SkXfermode::kSrc_Mode);
         const SkImage* bmps[] = { fSolidImg, fTransparentImg };
@@ skipping 57 matching lines @@
     }
 
 private:
     SkAutoTUnref<SkImage>   fSolidImg;
     SkAutoTUnref<SkImage>   fTransparentImg;
 
     typedef skiagm::GM INHERITED;
 };
 DEF_GM( return new ColorMatrixGM; )