Use unique pointers for U2fPacket and U2fMessage

device/u2f/u2f_hid_device.h

 // 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.
 
 #ifndef DEVICE_U2F_U2F_HID_DEVICE_H_
 #define DEVICE_U2F_U2F_HID_DEVICE_H_
 
 #include <list>
 
 #include "device/hid/hid_service.h"
@@ skipping 25 matching lines @@
   static bool IsTestEnabled();
 
  private:
   FRIEND_TEST_ALL_PREFIXES(U2fHidDeviceTest, TestConnectionFailure);
   FRIEND_TEST_ALL_PREFIXES(U2fHidDeviceTest, TestDeviceError);
 
   // Internal state machine states
   enum class State { INIT, CONNECTED, BUSY, IDLE, DEVICE_ERROR };
 
   using U2fHidMessageCallback =
-      base::OnceCallback<void(bool, scoped_refptr<U2fMessage>)>;
+      base::OnceCallback<void(bool, std::unique_ptr<U2fMessage>)>;
 
   // Open a connection to this device
   void Connect(const HidService::ConnectCallback& callback);
   void OnConnect(std::unique_ptr<U2fApduCommand> command,
                  const DeviceCallback& callback,
                  scoped_refptr<HidConnection> connection);
   // Ask device to allocate a unique channel id for this connection
   void AllocateChannel(std::unique_ptr<U2fApduCommand> command,
                        const DeviceCallback& callback);
   void OnAllocateChannel(std::vector<uint8_t> nonce,
                          std::unique_ptr<U2fApduCommand> command,
                          const DeviceCallback& callback,
                          bool success,
-                         scoped_refptr<U2fMessage> message);
+                         std::unique_ptr<U2fMessage> message);
   void Transition(std::unique_ptr<U2fApduCommand> command,
                   const DeviceCallback& callback);
   // Write all message packets to device, and read response if expected
-  void WriteMessage(scoped_refptr<U2fMessage> message,
+  void WriteMessage(std::unique_ptr<U2fMessage> message,
                     bool response_expected,
                     U2fHidMessageCallback callback);
-  void PacketWritten(scoped_refptr<U2fMessage> message,
+  void PacketWritten(std::unique_ptr<U2fMessage> message,
                      bool response_expected,
                      U2fHidMessageCallback callback,
                      bool success);
   // Read all response message packets from device
   void ReadMessage(U2fHidMessageCallback callback);
   void MessageReceived(const DeviceCallback& callback,
                        bool success,
-                       scoped_refptr<U2fMessage> message);
+                       std::unique_ptr<U2fMessage> message);
   void OnRead(U2fHidMessageCallback callback,
               bool success,
               scoped_refptr<net::IOBuffer> buf,
               size_t size);
-  void OnReadContinuation(scoped_refptr<U2fMessage> message,
+  void OnReadContinuation(std::unique_ptr<U2fMessage> message,
                           U2fHidMessageCallback,
                           bool success,
                           scoped_refptr<net::IOBuffer> buf,
                           size_t size);
   void OnWink(const WinkCallback& callback,
               bool success,
-              scoped_refptr<U2fMessage> response);
+              std::unique_ptr<U2fMessage> response);
 
   State state_;
   std::list<std::pair<std::unique_ptr<U2fApduCommand>, DeviceCallback>>
       pending_transactions_;
   scoped_refptr<HidDeviceInfo> device_info_;
   scoped_refptr<HidConnection> connection_;
   base::WeakPtrFactory<U2fHidDevice> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(U2fHidDevice);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_U2F_U2F_HID_DEVICE_H_