Use sk_sp-based shader creation APIs

ui/native_theme/native_theme_base.cc

Index: ui/native_theme/native_theme_base.cc
diff --git a/ui/native_theme/native_theme_base.cc b/ui/native_theme/native_theme_base.cc
index 9dbeceeff4176f6e2f6fd0e49eca6b2a11a489e3..017b07afe9675c99b1c2fc2e4b1362d12cd26732 100644
--- a/ui/native_theme/native_theme_base.cc
+++ b/ui/native_theme/native_theme_base.cc
@@ -698,12 +698,11 @@ void NativeThemeBase::PaintButton(SkCanvas* canvas,
     std::swap(gradient_bounds[0], gradient_bounds[1]);
   SkColor colors[2] = { light_color, base_color };
 
-  skia::RefPtr<SkShader> shader = skia::AdoptRef(
-      SkGradientShader::CreateLinear(
-          gradient_bounds, colors, NULL, 2, SkShader::kClamp_TileMode));
   paint.setStyle(SkPaint::kFill_Style);
   paint.setAntiAlias(true);
-  paint.setShader(shader.get());
+  paint.setShader(
+      SkGradientShader::MakeLinear(
+          gradient_bounds, colors, NULL, 2, SkShader::kClamp_TileMode));
 
   canvas->drawRoundRect(skrect, SkIntToScalar(1), SkIntToScalar(1), paint);
   paint.setShader(NULL);