Add U2F device enumeration class

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"
 #include "u2f_device.h"
 
 namespace net {
 class IOBuffer;
 }  // namespace net
 
 namespace device {
 
 class U2fMessage;
 class HidConnection;
 class HidDeviceInfo;
 
 class U2fHidDevice : public U2fDevice {
  public:
   U2fHidDevice(scoped_refptr<HidDeviceInfo>);
-  ~U2fHidDevice();
+  ~U2fHidDevice() final;
 
   // Send a U2f command to this device
   void DeviceTransact(std::unique_ptr<U2fApduCommand> command,
                       const DeviceCallback& callback) final;
   // Send a wink command if supported
   void TryWink(const WinkCallback& callback) final;
   // Use a string identifier to compare to other devices
   std::string GetId() final;
   // Command line flag to enable tests on actual U2f HID hardware
   static bool IsTestEnabled();
@@ skipping 55 matching lines @@
   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_