more shader-->sp conversions

gm/tinybitmap.cpp

Index: gm/tinybitmap.cpp
diff --git a/gm/tinybitmap.cpp b/gm/tinybitmap.cpp
index 7942b4266afb3e27a492ac5e4f29ecd725e0ab1f..1162b2d2d13adaccd7f0b09ec6f482f2cc11fc2e 100644
--- a/gm/tinybitmap.cpp
+++ b/gm/tinybitmap.cpp
@@ -44,12 +44,10 @@ protected:
 
     virtual void onDraw(SkCanvas* canvas) {
         SkBitmap bm = make_bitmap();
-        SkShader* s =
-            SkShader::CreateBitmapShader(bm, SkShader::kRepeat_TileMode,
-                                         SkShader::kMirror_TileMode);
         SkPaint paint;
         paint.setAlpha(0x80);
-        paint.setShader(s)->unref();
+        paint.setShader(SkShader::MakeBitmapShader(bm, SkShader::kRepeat_TileMode,
+                                                   SkShader::kMirror_TileMode));
         canvas->drawPaint(paint);
     }