Remove win8/metro_driver

win8/metro_driver/ime/input_source_observer.h

-// Copyright 2013 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 WIN8_METRO_DRIVER_IME_INPUT_SOURCE_OBSERVER_H_
-#define WIN8_METRO_DRIVER_IME_INPUT_SOURCE_OBSERVER_H_
-
-#include <Windows.h>
-
-
-namespace metro_driver {
-
-// An observer interface implemented by objects that want to be informed
-// when the active language profile is changed.
-class InputSourceObserver {
- public:
-  virtual ~InputSourceObserver() {}
-
-  // Called when the active language profile is changed.
-  virtual void OnInputSourceChanged() = 0;
-};
-
-}  // namespace metro_driver
-
-#endif  // WIN8_METRO_DRIVER_IME_INPUT_SOURCE_OBSERVER_H_