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

base/sys_info_mac.mm

 // Copyright 2016 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.
 
 #include "base/sys_info.h"
 
 #include <ApplicationServices/ApplicationServices.h>
 #include <CoreServices/CoreServices.h>
 #import <Foundation/Foundation.h>
 #include <mach/mach_host.h>
@@ skipping 33 matching lines @@
     NSOperatingSystemVersion version = [processInfo operatingSystemVersion];
     *major_version = version.majorVersion;
     *minor_version = version.minorVersion;
     *bugfix_version = version.patchVersion;
   } else {
     // -[NSProcessInfo operatingSystemVersion] is documented available in 10.10.
     // It's also available via a private API since 10.9.2. For the remaining
     // cases in 10.9, rely on ::Gestalt(..). Since this code is only needed for
     // 10.9.0 and 10.9.1 and uses the recommended replacement thereafter,
     // suppress the warning for this fallback case.
-    DCHECK(base::mac::IsOSMavericks());
+    DCHECK(base::mac::IsOS10_9());
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wdeprecated-declarations"
     Gestalt(gestaltSystemVersionMajor,
             reinterpret_cast<SInt32*>(major_version));
     Gestalt(gestaltSystemVersionMinor,
             reinterpret_cast<SInt32*>(minor_version));
     Gestalt(gestaltSystemVersionBugFix,
             reinterpret_cast<SInt32*>(bugfix_version));
 #pragma clang diagnostic pop
   }
@@ skipping 45 matching lines @@
 
 std::string SysInfo::HardwareModelName() {
   char model[256];
   size_t len = sizeof(model);
   if (sysctlbyname("hw.model", model, &len, NULL, 0) == 0)
     return std::string(model, 0, len);
   return std::string();
 }
 
 }  // namespace base