Revert of HID-detection screen moved to screenContext.

chrome/browser/chromeos/login/screens/hid_detection_model.h

-// Copyright 2014 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 CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_HID_DETECTION_MODEL_H_
-#define CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_HID_DETECTION_MODEL_H_
-
-#include "base/callback_forward.h"
-#include "chrome/browser/chromeos/login/screens/base_screen.h"
-
-namespace chromeos {
-
-class BaseScreenDelegate;
-class HIDDetectionView;
-
-class HIDDetectionModel : public BaseScreen {
- public:
-  static const char kContextKeyKeyboardState[];
-  static const char kContextKeyMouseState[];
-  static const char kContextKeyNumKeysEnteredExpected[];
-  static const char kContextKeyNumKeysEnteredPinCode[];
-  static const char kContextKeyPinCode[];
-  static const char kContextKeyMouseDeviceName[];
-  static const char kContextKeyKeyboardDeviceName[];
-  static const char kContextKeyKeyboardLabel[];
-  static const char kContextKeyContinueButtonEnabled[];
-
-  explicit HIDDetectionModel(BaseScreenDelegate* base_screen_delegate);
-  ~HIDDetectionModel() override;
-
-  // BaseScreen implementation:
-  std::string GetName() const override;
-
-  // Called when continue button was clicked.
-  virtual void OnContinueButtonClicked() = 0;
-
-  // Checks if we should show the screen or enough devices already present.
-  // Calls corresponding set of actions based on the bool result.
-  virtual void CheckIsScreenRequired(
-      const base::Callback<void(bool)>& on_check_done) = 0;
-
-  // This method is called, when view is being destroyed. Note, if model
-  // is destroyed earlier then it has to call Unbind().
-  virtual void OnViewDestroyed(HIDDetectionView* view) = 0;
-};
-
-}  // namespace chromeos
-
-#endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_HID_DETECTION_MODEL_H_