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

ui/gfx/render_text_mac.mm

Index: ui/gfx/render_text_mac.mm
diff --git a/ui/gfx/render_text_mac.mm b/ui/gfx/render_text_mac.mm
index bd62b5d4aa07586f45cf61026dd8c5460164b25a..e380333c8c88f471ac158b6c5f30bfc043d3d371 100644
--- a/ui/gfx/render_text_mac.mm
+++ b/ui/gfx/render_text_mac.mm
@@ -29,7 +29,7 @@ namespace {
 // 10.10.
 base::ScopedCFTypeRef<CTFontRef> CopyFontWithSymbolicTraits(CTFontRef font,
                                                             int sym_traits) {
-  if (base::mac::IsOSElCapitanOrLater()) {
+  if (base::mac::IsAtLeastOS10_11()) {
     return base::ScopedCFTypeRef<CTFontRef>(CTFontCreateCopyWithSymbolicTraits(
         font, 0, nullptr, sym_traits, sym_traits));
   }