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

ui/native_theme/native_theme_mac.mm

Index: ui/native_theme/native_theme_mac.mm
diff --git a/ui/native_theme/native_theme_mac.mm b/ui/native_theme/native_theme_mac.mm
index 6962a704f3c471b2ab3b81b3f18d8f4f82d4c672..5f1f8d9d83cc11ef14e0c7e31ca0fec6b37b8563 100644
--- a/ui/native_theme/native_theme_mac.mm
+++ b/ui/native_theme/native_theme_mac.mm
@@ -181,8 +181,8 @@ SkColor NativeThemeMac::GetSystemColor(ColorId color_id) const {
     case kColorId_MenuBackgroundColor:
       return kMenuPopupBackgroundColor;
     case kColorId_MenuSeparatorColor:
-      return base::mac::IsOSMavericks() ? kMenuSeparatorColorMavericks
-                                        : kMenuSeparatorColor;
+      return base::mac::IsOS10_9() ? kMenuSeparatorColorMavericks
+                                   : kMenuSeparatorColor;
     case kColorId_MenuBorderColor:
       return kMenuBorderColor;
 
@@ -243,7 +243,7 @@ void NativeThemeMac::PaintMenuPopupBackground(
     const MenuBackgroundExtraParams& menu_background) const {
   SkPaint paint;
   paint.setAntiAlias(true);
-  if (base::mac::IsOSMavericks())
+  if (base::mac::IsOS10_9())
     paint.setColor(kMenuPopupBackgroundColorMavericks);
   else
     paint.setColor(kMenuPopupBackgroundColor);