base::mac::IsOSSierra() -> base::mac::IsOS10_12(), etc.

ui/native_theme/native_theme_mac_unittest.cc

 // Copyright 2014 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/base/material_design/material_design_controller.h"
 #include "ui/native_theme/native_theme_mac.h"
 
 #include "base/mac/mac_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 23 matching lines @@
 }
 
 // Spot-check some system colours that can't be changed through System
 // Preferences.
 TEST_F(NativeThemeMacTest, SystemColorSpotChecks) {
   NativeTheme* native_theme = NativeThemeMac::instance();
   const SkColor kWindowColorCatsMavericks = SkColorSetARGB(255, 232, 232, 232);
   const SkColor kWindowColorYosemite = SkColorSetARGB(255, 236, 236, 236);
   SkColor dialogColor =
       native_theme->GetSystemColor(NativeTheme::kColorId_WindowBackground);
-  if (base::mac::IsOSYosemiteOrLater())
+  if (base::mac::IsAtLeastOS10_10())
     EXPECT_EQ(dialogColor, kWindowColorYosemite);
   else
     EXPECT_EQ(dialogColor, kWindowColorCatsMavericks);
 }
 
 }  // namespace ui