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

third_party/WebKit/Source/platform/mac/VersionUtilMac.mm

 // Copyright 2015 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.
 
 #import "platform/mac/VersionUtilMac.h"
 
 #include <sstream>
 #include <string>
 #include <sys/utsname.h>
 
@@ skipping 30 matching lines @@
 
 // Returns the running system's Mac OS X minor version. This is the |y| value
 // in 10.y or 10.y.z. Don't call this, it's an implementation detail and the
 // result is meant to be cached by MacOSXMinorVersion.
 int MacOSXMinorVersionInternal()
 {
     int darwinMajorVersion = DarwinMajorVersionInternal();
     return darwinMajorVersion - 4;
 }
 
+} // namespace
+
 // Returns the running system's Mac OS X minor version. This is the |y| value
 // in 10.y or 10.y.z.
-int MacOSXMinorVersion()
+int blink::internal::MacOSXMinorVersion()
 {
     static int minorVersion = MacOSXMinorVersionInternal();
     return minorVersion;
 }
-
-enum {
-    MAVERICKS_MINOR_VERSION = 9,
-    YOSEMITE_MINOR_VERSION = 10,
-    EL_CAPITAN_MINOR_VERSION = 11,
-};
-
-} // namespace
-
-namespace blink {
-
-bool IsOSMavericks()
-{
-    return MacOSXMinorVersion() == MAVERICKS_MINOR_VERSION;
-}
-
-bool IsOSYosemite()
-{
-    return MacOSXMinorVersion() == YOSEMITE_MINOR_VERSION;
-}
-
-bool IsOSElCapitan()
-{
-    return MacOSXMinorVersion() == EL_CAPITAN_MINOR_VERSION;
-}
-
-} // namespace blink