Convert //sync from scoped_ptr to std::unique_ptr

sync/util/nigori.h

 // Copyright 2012 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.
 
 #ifndef SYNC_UTIL_NIGORI_H_
 #define SYNC_UTIL_NIGORI_H_
 
 #include <stddef.h>
 
+#include <memory>
 #include <string>
 
-#include "base/memory/scoped_ptr.h"
 #include "sync/base/sync_export.h"
 
 namespace crypto {
 class SymmetricKey;
 }  // namespace crypto
 
 namespace syncer {
 
 // A (partial) implementation of Nigori, a protocol to securely store secrets in
 // the cloud. This implementation does not support server authentication or
@@ skipping 48 matching lines @@
   static const size_t kDerivedKeySizeInBits = 128;
   static const size_t kIvSize = 16;
   static const size_t kHashSize = 32;
 
   static const size_t kSaltIterations = 1001;
   static const size_t kUserIterations = 1002;
   static const size_t kEncryptionIterations = 1003;
   static const size_t kSigningIterations = 1004;
 
  private:
-  scoped_ptr<crypto::SymmetricKey> user_key_;
-  scoped_ptr<crypto::SymmetricKey> encryption_key_;
-  scoped_ptr<crypto::SymmetricKey> mac_key_;
+  std::unique_ptr<crypto::SymmetricKey> user_key_;
+  std::unique_ptr<crypto::SymmetricKey> encryption_key_;
+  std::unique_ptr<crypto::SymmetricKey> mac_key_;
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_UTIL_NIGORI_H_