Convert crypto to std::unique_ptr

components/user_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 "components/user_prefs/tracked/pref_hash_calculator.h"
 
 #include <stdint.h>
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/json/json_string_value_serializer.h"
 #include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/values.h"
 #include "crypto/hmac.h"
 
 namespace {
 
 // Calculates an HMAC of |message| using |key|, encoded as a hexadecimal string.
 std::string GetDigestString(const std::string& key,
                             const std::string& message) {
@@ skipping 94 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;
 }