Move tracked prefs into services/preferences/tracked.

components/user_prefs/tracked/device_id_stub.cc

Index: components/user_prefs/tracked/device_id_stub.cc
diff --git a/components/user_prefs/tracked/device_id_stub.cc b/components/user_prefs/tracked/device_id_stub.cc
deleted file mode 100644
index 07ffb944fe51b3c6e7da37bdb18e34d8d66811f4..0000000000000000000000000000000000000000
--- a/components/user_prefs/tracked/device_id_stub.cc
+++ /dev/null
@@ -1,11 +0,0 @@
-// 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 "base/logging.h"
-
-MachineIdStatus GetDeterministicMachineSpecificId(std::string* machine_id) {
-  DCHECK(machine_id);
-  return MachineIdStatus::NOT_IMPLEMENTED;
-}