Faster way to read the hostname on mac.

chrome/browser/policy/policy_path_parser_mac.mm

 // Copyright (c) 2011 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 "chrome/browser/policy/policy_path_parser.h"
 
 #include "base/logging.h"
 #include "base/sys_string_conversions.h"
 
 #import <Cocoa/Cocoa.h>
+#import <SystemConfiguration/SCDynamicStore.h>
+#import <SystemConfiguration/SCDynamicStoreCopySpecific.h>
 
 #include <string>
 
 namespace policy {
 
 namespace path_parser {
 
 const char* kUserNamePolicyVarName = "${user_name}";
 const char* kMachineNamePolicyVarName = "${machine_name}";
 const char* kMacUsersDirectory = "${users}";
@@ skipping 34 matching lines @@
     NSString* username = NSUserName();
     if (username) {
       result.replace(position, strlen(kUserNamePolicyVarName),
                      base::SysNSStringToUTF8(username));
     } else {
       LOG(ERROR) << "Username variable can not be resolved.";
     }
   }
   position = result.find(kMachineNamePolicyVarName);
   if (position != std::string::npos) {
-    NSString* machinename = [[NSHost currentHost] name];
+    SCDynamicStoreContext context = { 0, NULL, NULL, NULL };
+    SCDynamicStoreRef store = SCDynamicStoreCreate(kCFAllocatorDefault,
+                                                   CFSTR("policy_subsystem"),
+                                                   NULL, &context);
+    CFStringRef machinename = SCDynamicStoreCopyLocalHostName(store);
     if (machinename) {
       result.replace(position, strlen(kMachineNamePolicyVarName),
-                     base::SysNSStringToUTF8(machinename));
+                     base::SysCFStringRefToUTF8(machinename));
+      CFRelease(machinename);
     } else {
       LOG(ERROR) << "Machine name variable can not be resolved.";
     }
+    CFRelease(store);
   }
   return result;
 }
 
 }  // namespace path_parser
 
 }  // namespace policy