Make //crypto factories return std::unique_ptr<>s

crypto/mock_apple_keychain.h

 // Copyright (c) 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 CRYPTO_MOCK_KEYCHAIN_MAC_H_
 #define CRYPTO_MOCK_KEYCHAIN_MAC_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 191 matching lines @@
       const SecKeychainAttributeList& attribute_list,
       UInt32 tag);
 
   static const SecKeychainSearchRef kDummySearchRef;
 
   // Simulates the state when the user refuses to unclock the Keychain.
   // If true, reading and modifying a password value result in errSecAuthFailed.
   bool locked_;
 
   typedef struct KeychainPasswordData {
-    KeychainPasswordData() : data(NULL), length(0) {}
+    KeychainPasswordData() : data(nullptr), length(0) {}
     void* data;
     UInt32 length;
   } KeychainPasswordData;
 
   // Mutable because the MockAppleKeychain API requires its internal keychain
   // storage to be modifiable by users of this class.
   mutable MockKeychainAttributesMap keychain_attr_list_;
   mutable std::map<MockKeychainItemType,
                    KeychainPasswordData> keychain_data_;
   mutable MockKeychainItemType next_item_key_;
@@ skipping 25 matching lines @@
   // and |ItemFreeContent|.
   mutable int password_data_count_;
 
   // Records the password being set when |AddGenericPassword()| gets called.
   mutable std::string add_generic_password_;
 };
 
 }  // namespace crypto
 
 #endif  // CRYPTO_MOCK_KEYCHAIN_MAC_H_