ozone: evdev: Minor refactor of device open

ui/events/ozone/evdev/libgestures_glue/gesture_interpreter_libevdev_cros.h

 // 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_OZONE_EVDEV_LIBGESTURES_GLUE_GESTURE_INTERPRETER_LIBEVDEV_CROS_H_
 #define UI_EVENTS_OZONE_EVDEV_LIBGESTURES_GLUE_GESTURE_INTERPRETER_LIBEVDEV_CROS_H_
 
 #include <gestures/gestures.h>
 #include <libevdev/libevdev.h>
 
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/events/ozone/evdev/cursor_delegate_evdev.h"
+#include "ui/events/ozone/evdev/event_dispatch_callback.h"
 #include "ui/events/ozone/evdev/events_ozone_evdev_export.h"
 #include "ui/events/ozone/evdev/libgestures_glue/event_reader_libevdev_cros.h"
 
 namespace ui {
 
-class Event;
 class EventDeviceInfo;
 class EventModifiersEvdev;
 class CursorDelegateEvdev;
 
-typedef base::Callback<void(Event*)> EventDispatchCallback;
-
 // Convert libevdev-cros events to ui::Events using libgestures.
 //
 // This builds a GestureInterpreter for an input device (touchpad or
 // mouse).
 //
 // Raw input events must be preprocessed into a form suitable for
 // libgestures. The kernel protocol only emits changes to the device state,
 // so changes must be accumulated until a sync event. The full device state
 // at sync is then processed by libgestures.
 //
@@ skipping 45 matching lines @@
 
   // Gestures interpretation state.
   gestures::GestureInterpreter* interpreter_;
 
   DISALLOW_COPY_AND_ASSIGN(GestureInterpreterLibevdevCros);
 };
 
 }  // namspace ui
 
 #endif  // UI_EVENTS_OZONE_EVDEV_LIBGESTURES_GLUE_GESTURE_INTERPRETER_LIBEVDEV_CROS_H_