Revert of Add U2F request state machines

device/u2f/u2f_register.h

Index: device/u2f/u2f_register.h
diff --git a/device/u2f/u2f_register.h b/device/u2f/u2f_register.h
deleted file mode 100644
index 466127ed44f12aab7155a0fe5f576a484eb486c7..0000000000000000000000000000000000000000
--- a/device/u2f/u2f_register.h
+++ /dev/null
@@ -1,37 +0,0 @@
-// 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_REGISTER_H_
-#define DEVICE_U2F_U2F_REGISTER_H_
-
-#include <vector>
-
-#include "u2f_request.h"
-
-namespace device {
-
-class U2fRegister : public U2fRequest {
- public:
-  U2fRegister(const std::vector<uint8_t>& challenge_hash,
-              const std::vector<uint8_t>& app_param,
-              const ResponseCallback& cb);
-  ~U2fRegister() override;
-
-  static std::unique_ptr<U2fRequest> TryRegistration(
-      const std::vector<uint8_t>& challenge_hash,
-      const std::vector<uint8_t>& app_param,
-      const ResponseCallback& cb);
-
- private:
-  void TryDevice() override;
-  void OnTryDevice(U2fReturnCode, std::vector<uint8_t>);
-
-  std::vector<uint8_t> challenge_hash_;
-  std::vector<uint8_t> app_param_;
-  base::WeakPtrFactory<U2fRegister> weak_factory_;
-};
-
-}  // namespace device
-
-#endif  // DEVICE_U2F_U2F_REGISTER_H_