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

device/udev_linux/udev.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'conditions': [
     ['use_udev==1', {
       'targets': [
         {
           'target_name': 'udev_linux',
           'type': 'static_library',
           'dependencies': [
             '../../base/base.gyp:base',
             '../../build/linux/system.gyp:udev',
           ],
           'include_dirs': [
             '../..',
           ],
           'sources': [
-            'udev.cc',
-            'udev.h',
+            'scoped_udev.h',
           ],
         },
       ],
     }],
   ]
 }