Move all files related to tracked preferences from c/b/prefs to c/b/prefs/tracked.

chrome/browser/prefs/tracked/pref_hash_calculator.cc

 // Copyright 2013 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/prefs/pref_hash_calculator.h"
+#include "chrome/browser/prefs/tracked/pref_hash_calculator.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/json/json_string_value_serializer.h"
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/values.h"
 #include "crypto/hmac.h"
@@ skipping 99 matching lines @@
                          digest_string)) {
     return VALID;
   }
   if (VerifyDigestString(seed_,
                          GetMessage(legacy_device_id_, path, value_as_string),
                          digest_string)) {
     return VALID_SECURE_LEGACY;
   }
   return INVALID;
 }