Modify U2F apdu classes to use unique pointers

device/u2f/u2f_apdu_response.cc

 // Copyright 2017 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 "base/memory/ptr_util.h"
+
 #include "u2f_apdu_response.h"
 
 namespace device {
-scoped_refptr<U2fApduResponse> U2fApduResponse::CreateFromMessage(
+std::unique_ptr<U2fApduResponse> U2fApduResponse::CreateFromMessage(
     const std::vector<uint8_t>& message) {
   uint16_t status_bytes;
   Status response_status;
 
   // Invalid message size, data is appended by status byte
   if (message.size() < 2)
     return nullptr;
   status_bytes = message[message.size() - 2] << 8;
   status_bytes |= message[message.size() - 1];
   response_status = static_cast<Status>(status_bytes);
   std::vector<uint8_t> data(message.begin(), message.end() - 2);
 
-  return make_scoped_refptr(
-      new U2fApduResponse(std::move(data), response_status));
+  return base::MakeUnique<U2fApduResponse>(std::move(data), response_status);
 }
 
 U2fApduResponse::U2fApduResponse(std::vector<uint8_t> message,
                                  Status response_status)
     : response_status_(response_status), data_(std::move(message)) {}
 
 U2fApduResponse::~U2fApduResponse() {}
 
 }  // namespace device