mac: Remove code that was only needed on 10.5

sync/util/get_session_name_mac.mm

 // Copyright (c) 2012 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 "sync/util/get_session_name_mac.h"
 
 #import <Foundation/Foundation.h>
 #import <SystemConfiguration/SCDynamicStoreCopySpecific.h>
 #include <sys/sysctl.h>  // sysctlbyname()
 
 #include "base/mac/foundation_util.h"
 #include "base/mac/mac_util.h"
 #include "base/memory/scoped_nsobject.h"
 #include "base/string_util.h"
 #include "base/sys_info.h"
 #include "base/sys_string_conversions.h"
 
-@interface NSHost(SnowLeopardAPI)
-- (NSString*)localizedName;
-@end
-
 namespace syncer {
 namespace internal {
 
 std::string GetHardwareModelName() {
   NSHost* myHost = [NSHost currentHost];
-  if ([myHost respondsToSelector:@selector(localizedName)])
-    return base::SysNSStringToUTF8([myHost localizedName]);
-
-  // Fallback for 10.5
-  scoped_nsobject<NSString> computerName(base::mac::CFToNSCast(
-      SCDynamicStoreCopyComputerName(NULL, NULL)));
-  if (computerName.get() != NULL)
-    return base::SysNSStringToUTF8(computerName.get());
-
-  // If all else fails, return to using a slightly nicer version of the
-  // hardware model.
-  char modelBuffer[256];
-  size_t length = sizeof(modelBuffer);
-  if (!sysctlbyname("hw.model", modelBuffer, &length, NULL, 0)) {
-    for (size_t i = 0; i < length; i++) {
-      if (IsAsciiDigit(modelBuffer[i]))
-        return std::string(modelBuffer, 0, i);
-    }
-    return std::string(modelBuffer, 0, length);
-  }
-  return "Unknown";
+  return base::SysNSStringToUTF8([myHost localizedName]);
 }
 
 }  // namespace internal
 }  // namespace syncer