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

chrome/browser/ui/cocoa/tabs/tab_strip_view.mm

Index: chrome/browser/ui/cocoa/tabs/tab_strip_view.mm
diff --git a/chrome/browser/ui/cocoa/tabs/tab_strip_view.mm b/chrome/browser/ui/cocoa/tabs/tab_strip_view.mm
index 83369b6bf6514bc5648c61fdee6ee34857fbb1f7..3f76bf3283f947c9f4d24baa304c045a8b5feca1 100644
--- a/chrome/browser/ui/cocoa/tabs/tab_strip_view.mm
+++ b/chrome/browser/ui/cocoa/tabs/tab_strip_view.mm
@@ -374,7 +374,7 @@
   // NSVisualEffectView is only used in Material Design, and only available on
   // OS X 10.10 and higher.
   if (!ui::MaterialDesignController::IsModeMaterial() ||
-      !base::mac::IsOSYosemiteOrLater()) {
+      !base::mac::IsAtLeastOS10_10()) {
     return nil;
   }