login: Remove scoped keyboard disabler.

ui/keyboard/scoped_keyboard_disabler.cc

-// 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.
-
-#include "ui/keyboard/scoped_keyboard_disabler.h"
-
-namespace keyboard {
-namespace {
-
-bool g_force_disable_keyboard = false;
-
-}
-
-ScopedKeyboardDisabler::ScopedKeyboardDisabler()
-  : force_disable_keyboard_state_(g_force_disable_keyboard) {}
-
-ScopedKeyboardDisabler::~ScopedKeyboardDisabler() {
-  g_force_disable_keyboard = force_disable_keyboard_state_;
-}
-
-void ScopedKeyboardDisabler::SetForceDisableVirtualKeyboard(bool disable) {
-  g_force_disable_keyboard = disable;
-}
-
-// static
-bool ScopedKeyboardDisabler::GetForceDisableVirtualKeyboard() {
-  return g_force_disable_keyboard;
-}
-
-}  // namespace keyboard