Move tracked prefs into services/preferences/tracked.

services/preferences/tracked/tracked_preference.h

Index: services/preferences/tracked/tracked_preference.h
diff --git a/components/user_prefs/tracked/tracked_preference.h b/services/preferences/tracked/tracked_preference.h
similarity index 90%
rename from components/user_prefs/tracked/tracked_preference.h
rename to services/preferences/tracked/tracked_preference.h
index 97666a0fcf8b4eb0dc5dbe70dccd45f21036db82..eeb333c52a12ff2ffd109fd9cc211e3bb516dd52 100644
--- a/components/user_prefs/tracked/tracked_preference.h
+++ b/services/preferences/tracked/tracked_preference.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef COMPONENTS_USER_PREFS_TRACKED_TRACKED_PREFERENCE_H_
-#define COMPONENTS_USER_PREFS_TRACKED_TRACKED_PREFERENCE_H_
+#ifndef SERVICES_PREFERENCES_TRACKED_TRACKED_PREFERENCE_H_
+#define SERVICES_PREFERENCES_TRACKED_TRACKED_PREFERENCE_H_
 
 class PrefHashStoreTransaction;
 
@@ -41,4 +41,4 @@ class TrackedPreference {
       PrefHashStoreTransaction* external_validation_transaction) const = 0;
 };
 
-#endif  // COMPONENTS_USER_PREFS_TRACKED_TRACKED_PREFERENCE_H_
+#endif  // SERVICES_PREFERENCES_TRACKED_TRACKED_PREFERENCE_H_