chromeos: Remove some IME methods from ash::SystemTrayDelegate

chrome/browser/ui/ash/ime_controller_chromeos.h

-// Copyright (c) 2012 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_UI_ASH_IME_CONTROLLER_CHROMEOS_H_
-#define CHROME_BROWSER_UI_ASH_IME_CONTROLLER_CHROMEOS_H_
-
-#include "ash/ime_control_delegate.h"
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-
-// A class which controls ime when an IME shortcut key such as Control+space is
-// pressed.
-class ImeController : public ash::ImeControlDelegate {
- public:
-  ImeController() {}
-  ~ImeController() override {}
-
-  // Overridden from ash::ImeControlDelegate:
-  bool CanCycleIme() override;
-  void HandleNextIme() override;
-  void HandlePreviousIme() override;
-  bool CanSwitchIme(const ui::Accelerator& accelerator) override;
-  void HandleSwitchIme(const ui::Accelerator& accelerator) override;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(ImeController);
-};
-
-#endif  // CHROME_BROWSER_UI_ASH_IME_CONTROLLER_CHROMEOS_H_