Cleanup: Merge device/udev_linux/udev.{cc,h} into device/udev_linux/scoped_udev.h.

device/udev_linux/udev.cc

-// 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.
-
-#include <libudev.h>
-
-#include "device/udev_linux/udev.h"
-
-namespace device {
-
-void UdevDeleter::operator()(udev* dev) const {
-  udev_unref(dev);
-}
-
-void UdevEnumerateDeleter::operator()(udev_enumerate* enumerate) const {
-  udev_enumerate_unref(enumerate);
-}
-
-void UdevDeviceDeleter::operator()(udev_device* device) const {
-  udev_device_unref(device);
-}
-
-void UdevMonitorDeleter::operator()(udev_monitor* monitor) const {
-  udev_monitor_unref(monitor);
-}
-
-}  // namespace device