Linux: Dynamically load libudev.

device/serial/serial.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,
   },
   'targets': [
     {
@@ skipping 13 matching lines @@
         'serial_serialization.mojom',
       ],
     },
     {
       # GN version: //device/serial
       'target_name': 'device_serial',
       'type': 'static_library',
       'conditions': [
         ['use_udev == 1', {
           'dependencies': [
-            '../../build/linux/system.gyp:udev',
+            '../udev_linux/udev.gyp:udev_linux',
           ],
         }, {
           'sources!': [
             'serial_device_enumerator_linux.cc',
             'serial_device_enumerator_linux.h',
           ],
         }],
       ],
       'dependencies': [
         'device_serial_mojo',
@@ skipping 53 matching lines @@
         'device_serial',
         'device_serial_mojo',
       ],
       'sources': [
         'test_serial_io_handler.cc',
         'test_serial_io_handler.h',
       ],
     },
   ],
 }