Move all event related devices from ui/events/ to ui/events/devices/

ui/events/input_device_event_observer.h

Index: ui/events/input_device_event_observer.h
diff --git a/ui/events/input_device_event_observer.h b/ui/events/input_device_event_observer.h
deleted file mode 100644
index c23fe9a6b7bb6f1e1c1746f432d9e8754b7b6518..0000000000000000000000000000000000000000
--- a/ui/events/input_device_event_observer.h
+++ /dev/null
@@ -1,21 +0,0 @@
-// 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 UI_EVENTS_INPUT_DEVICE_EVENT_OBSERVER_H_
-#define UI_EVENTS_INPUT_DEVICE_EVENT_OBSERVER_H_
-
-namespace ui {
-
-// DeviceDataManager observer used to announce input hotplug events.
-class InputDeviceEventObserver {
- public:
-  virtual ~InputDeviceEventObserver() {}
-
-  virtual void OnKeyboardDeviceConfigurationChanged() = 0;
-  virtual void OnTouchscreenDeviceConfigurationChanged() = 0;
-};
-
-}  // namespace ui
-
-#endif  // UI_EVENTS_INPUT_DEVICE_EVENT_OBSERVER_H_