Add timeout task to U2F HID state machine

device/u2f/u2f_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_DEVICE_H_
 #define DEVICE_U2F_U2F_DEVICE_H_
 
 #include <vector>
 
 #include "base/callback.h"
@@ skipping 21 matching lines @@
 
   using MessageCallback =
       base::Callback<void(ReturnCode, std::vector<uint8_t>)>;
   using VersionCallback =
       base::Callback<void(bool success, ProtocolVersion version)>;
   using DeviceCallback =
       base::Callback<void(bool success,
                           std::unique_ptr<U2fApduResponse> response)>;
   using WinkCallback = base::Callback<void()>;
 
-  ~U2fDevice();
+  virtual ~U2fDevice();
 
   // Raw messages parameters are defined by the specification at
   // https://fidoalliance.org/specs/fido-u2f-v1.0-nfc-bt-amendment-20150514/fido-u2f-raw-message-formats.html
   void Register(const std::vector<uint8_t>& appid_digest,
                 const std::vector<uint8_t>& challenge_digest,
                 const MessageCallback& callback);
   void Version(const VersionCallback& callback);
   void Sign(const std::vector<uint8_t>& appid_digest,
             const std::vector<uint8_t>& challenge_digest,
             const std::vector<uint8_t>& key_handle,
@@ skipping 35 matching lines @@
               std::unique_ptr<U2fApduResponse> response);
 
   base::WeakPtrFactory<U2fDevice> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(U2fDevice);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_U2F_U2F_DEVICE_H_