more shader-->sp conversions

gm/samplerstress.cpp

Index: gm/samplerstress.cpp
diff --git a/gm/samplerstress.cpp b/gm/samplerstress.cpp
index 4bec6784a891ed11830270d322dd03201bd1b7cb..f317cf9103d0ac6b9abcb44a59f0e00fd5a50db6 100644
--- a/gm/samplerstress.cpp
+++ b/gm/samplerstress.cpp
@@ -21,13 +21,9 @@ class SamplerStressGM : public GM {
 public:
     SamplerStressGM()
     : fTextureCreated(false)
-    , fShader(nullptr)
     , fMaskFilter(nullptr) {
     }
 
-    virtual ~SamplerStressGM() {
-    }
-
 protected:
 
     SkString onShortName() override {
@@ -69,15 +65,14 @@ protected:
     }
 
     void createShader() {
-        if (fShader.get()) {
+        if (fShader) {
             return;
         }
 
         createTexture();
 
-        fShader.reset(SkShader::CreateBitmapShader(fTexture,
-                                                   SkShader::kRepeat_TileMode,
-                                                   SkShader::kRepeat_TileMode));
+        fShader = SkShader::MakeBitmapShader(fTexture, SkShader::kRepeat_TileMode,
+                                             SkShader::kRepeat_TileMode);
     }
 
     void createMaskFilter() {
@@ -140,9 +135,9 @@ protected:
     }
 
 private:
-    SkBitmap      fTexture;
-    bool          fTextureCreated;
-    SkAutoTUnref<SkShader>     fShader;
+    SkBitmap        fTexture;
+    bool            fTextureCreated;
+    sk_sp<SkShader> fShader;
     SkAutoTUnref<SkMaskFilter> fMaskFilter;
 
     typedef GM INHERITED;