login: Remove scoped keyboard disabler.

ui/keyboard/scoped_keyboard_disabler.h

-// Copyright 2016 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 UI_KEYBOARD_SCOPED_KEYBOARD_DISABLER_H_
-#define UI_KEYBOARD_SCOPED_KEYBOARD_DISABLER_H_
-
-#include "base/macros.h"
-#include "ui/keyboard/keyboard_export.h"
-
-namespace keyboard {
-
-// Saves the force disable keyboard state, and restores the state when going out
-// of scope.
-class KEYBOARD_EXPORT ScopedKeyboardDisabler {
- public:
-  ScopedKeyboardDisabler();
-  ~ScopedKeyboardDisabler();
-
-  // Blocks the keyboard from showing up. This should only be used for cases
-  // where the focus needs to be passed around without poping up the keyboard.
-  // It needs to be turned off or this object needs to go out of scope when done
-  // with, otherwise the keyboard will not pop up again.
-  void SetForceDisableVirtualKeyboard(bool disable);
-
-  // Return true if keyboard has been blocked from showing up.
-  static bool GetForceDisableVirtualKeyboard();
-
- private:
-  const bool force_disable_keyboard_state_;
-
-  DISALLOW_COPY_AND_ASSIGN(ScopedKeyboardDisabler);
-};
-
-}  // namespace keyboard
-
-#endif  // UI_KEYBOARD_SCOPED_KEYBOARD_DISABLER_H_