Convert a few components from scoped_ptr to std::unique_ptr

components/os_crypt/os_crypt_mac.mm

 // Copyright 2014 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/os_crypt/os_crypt.h"
 
 #include <CommonCrypto/CommonCryptor.h>  // for kCCBlockSizeAES128
 #include <stddef.h>
 
 #include "base/command_line.h"
 #include "base/debug/leak_annotations.h"
 #include "base/logging.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/synchronization/lock.h"
 #include "components/os_crypt/keychain_password_mac.h"
 #include "components/os_crypt/os_crypt_switches.h"
 #include "crypto/apple_keychain.h"
 #include "crypto/encryptor.h"
 #include "crypto/mock_apple_keychain.h"
 #include "crypto/symmetric_key.h"
 
 using crypto::AppleKeychain;
@@ skipping 139 matching lines @@
   if (!encryptor.Decrypt(raw_ciphertext, plaintext))
     return false;
 
   return true;
 }
 
 void OSCrypt::UseMockKeychain(bool use_mock) {
   use_mock_keychain = use_mock;
 }