Revert of Add U2F request state machines

device/u2f/u2f_sign.h

Index: device/u2f/u2f_sign.h
diff --git a/device/u2f/u2f_sign.h b/device/u2f/u2f_sign.h
deleted file mode 100644
index e924137f81324e3a4d4ba05eafa602152379eac0..0000000000000000000000000000000000000000
--- a/device/u2f/u2f_sign.h
+++ /dev/null
@@ -1,51 +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_SIGN_H_
-#define DEVICE_U2F_U2F_SIGN_H_
-
-#include <vector>
-
-#include "u2f_request.h"
-
-namespace device {
-
-class U2fSign : public U2fRequest {
- public:
-  U2fSign(const std::vector<std::vector<uint8_t>>& registered_keys,
-          const std::vector<uint8_t>& challenge_hash,
-          const std::vector<uint8_t>& app_param,
-          const ResponseCallback& cb);
-  ~U2fSign() override;
-
-  static std::unique_ptr<U2fRequest> TrySign(
-      const std::vector<std::vector<uint8_t>>& registered_keys,
-      const std::vector<uint8_t>& challenge_hash,
-      const std::vector<uint8_t>& app_param,
-      const ResponseCallback& cb);
-
- private:
-  void TryDevice() override;
-  void OnTryDevice(std::vector<std::vector<uint8_t>>::const_iterator,
-                   U2fReturnCode,
-                   std::vector<uint8_t>);
-
-  const std::vector<std::vector<uint8_t>> registered_keys_;
-  std::vector<uint8_t> challenge_hash_;
-  std::vector<uint8_t> app_param_;
-  const std::vector<uint8_t> kBogusAppParam = {
-      0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
-      0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
-      0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41};
-  const std::vector<uint8_t> kBogusChallenge = {
-      0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42,
-      0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42,
-      0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42};
-
-  base::WeakPtrFactory<U2fSign> weak_factory_;
-};
-
-}  // namespace device
-
-#endif  // DEVICE_U2F_U2F_SIGN_H_