ozone: evdev: Minor refactor of device open

ui/events/ozone/evdev/event_factory_evdev.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_EVENT_FACTORY_EVDEV_H_
 #define UI_EVENTS_OZONE_EVDEV_EVENT_FACTORY_EVDEV_H_
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
@@ skipping 23 matching lines @@
                     DeviceManager* device_manager);
   virtual ~EventFactoryEvdev();
 
   void DispatchUiEvent(Event* event);
 
   void WarpCursorTo(gfx::AcceleratedWidget widget,
                     const gfx::PointF& location);
 
  private:
   // Open device at path & starting processing events (on UI thread).
-  void AttachInputDevice(const base::FilePath& file_path,
-                         scoped_ptr<EventConverterEvdev> converter);
+  void AttachInputDevice(scoped_ptr<EventConverterEvdev> converter);
 
   // Close device at path (on UI thread).
   void DetachInputDevice(const base::FilePath& file_path);
 
   void NotifyHotplugEventObserver(const EventConverterEvdev& converter);
 
   int NextDeviceId();
 
   // DeviceEventObserver overrides:
   //
@@ skipping 26 matching lines @@
 
   // Support weak pointers for attach & detach callbacks.
   base::WeakPtrFactory<EventFactoryEvdev> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(EventFactoryEvdev);
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_OZONE_EVDEV_EVENT_FACTORY_EVDEV_H_