Use sk_sp-based shader creation APIs

ui/native_theme/native_theme_mac.mm

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/native_theme/native_theme_mac.h"
 
 #import <Cocoa/Cocoa.h>
 #include <stddef.h>
 
 #include "base/mac/mac_util.h"
@@ skipping 250 matching lines @@
       paint.setColor(GetSystemColor(kColorId_HoverMenuItemBackgroundColor));
       canvas->drawRect(gfx::RectToSkRect(rect), paint);
       break;
     default:
       NOTREACHED();
       break;
   }
 }
 
 // static
-skia::RefPtr<SkShader> NativeThemeMac::GetButtonBackgroundShader(
+sk_sp<SkShader> NativeThemeMac::GetButtonBackgroundShader(
     NativeTheme::State state, int height) {
   typedef SkColor ColorByState[NativeTheme::State::kNumStates];
   SkPoint gradient_points[2];
   gradient_points[0].iset(0, 0);
   gradient_points[1].iset(0, height);
 
   SkScalar gradient_positions[] = { 0.0, 0.38, 1.0 };
 
   ColorByState start_colors;
   start_colors[NativeTheme::State::kDisabled] = gfx::kMaterialGrey300;
   start_colors[NativeTheme::State::kHovered] = gfx::kMaterialBlue300;
   start_colors[NativeTheme::State::kNormal] = gfx::kMaterialBlue300;
   start_colors[NativeTheme::State::kPressed] = gfx::kMaterialBlue300;
   ColorByState end_colors;
   end_colors[NativeTheme::State::kDisabled] = gfx::kMaterialGrey300;
   end_colors[NativeTheme::State::kHovered] = gfx::kMaterialBlue700;
   end_colors[NativeTheme::State::kNormal] = gfx::kMaterialBlue700;
   end_colors[NativeTheme::State::kPressed] = gfx::kMaterialBlue700;
 
   SkColor gradient_colors[] = {
     start_colors[state], start_colors[state], end_colors[state]
   };
 
-  skia::RefPtr<SkShader> gradient_shader = skia::AdoptRef(
-      SkGradientShader::CreateLinear(
-          gradient_points, gradient_colors, gradient_positions, 3,
-          SkShader::kClamp_TileMode));
-  return gradient_shader;
+  return SkGradientShader::MakeLinear(
+      gradient_points, gradient_colors, gradient_positions, 3,
+      SkShader::kClamp_TileMode);
 }
 
 NativeThemeMac::NativeThemeMac() {
 }
 
 NativeThemeMac::~NativeThemeMac() {
 }
 
 }  // namespace ui