Move tracked prefs into services/preferences/tracked.

components/user_prefs/tracked/device_id_mac.cc

-// 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.
-
-#include "components/user_prefs/tracked/device_id.h"
-
-#include <IOKit/IOKitLib.h>
-
-#include "base/mac/foundation_util.h"
-#include "base/mac/scoped_cftyperef.h"
-#include "base/mac/scoped_ioobject.h"
-#include "base/strings/sys_string_conversions.h"
-
-MachineIdStatus GetDeterministicMachineSpecificId(std::string* machine_id) {
-  base::mac::ScopedIOObject<io_service_t> platform_expert(
-      IOServiceGetMatchingService(kIOMasterPortDefault,
-                                  IOServiceMatching("IOPlatformExpertDevice")));
-  if (!platform_expert.get())
-    return MachineIdStatus::FAILURE;
-
-  base::ScopedCFTypeRef<CFTypeRef> uuid(IORegistryEntryCreateCFProperty(
-      platform_expert, CFSTR(kIOPlatformUUIDKey), kCFAllocatorDefault, 0));
-  if (!uuid.get())
-    return MachineIdStatus::FAILURE;
-
-  CFStringRef uuid_string = base::mac::CFCast<CFStringRef>(uuid);
-  if (!uuid_string)
-    return MachineIdStatus::FAILURE;
-
-  *machine_id = base::SysCFStringRefToUTF8(uuid_string);
-  return MachineIdStatus::SUCCESS;
-}