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

sandbox/mac/os_compatibility.cc

Index: sandbox/mac/os_compatibility.cc
diff --git a/sandbox/mac/os_compatibility.cc b/sandbox/mac/os_compatibility.cc
index dce874c3c03ba79e23a11ccdba4c96774208b796..1e0ba5be76faa7802182862b353526d63a29a9a5 100644
--- a/sandbox/mac/os_compatibility.cc
+++ b/sandbox/mac/os_compatibility.cc
@@ -181,7 +181,7 @@ class OSCompatibility_10_10 : public OSCompatibility {
 
 // static
 std::unique_ptr<OSCompatibility> OSCompatibility::CreateForPlatform() {
-  if (base::mac::IsOSMavericks())
+  if (base::mac::IsOS10_9())
     return base::WrapUnique(new OSCompatibility_10_7());
   else
     return base::WrapUnique(new OSCompatibility_10_10());