Make udev target disappear on linux when use_udev==0

chrome/chrome_browser.gypi

 # Copyright 2012 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': {
     # All .cc, .h, .m, and .mm files under browser except for:
     # * tests and mocks.
     # * code below browser/chromeos
     # * code below browser/extensions
@@ skipping 3133 matching lines @@
                 'safe_browsing_proto',
               ],
             }],
             ['safe_browsing == 2', {
               'defines': [
                 'MOBILE_SAFE_BROWSING',
               ],
             }],
           ],
         }],
+        ['use_udev == 1', {
+          'dependencies': [
+            '../build/linux/system.gyp:udev',
+          ],
+        }],
         ['OS=="linux"', {
           'dependencies': [
-            '../build/linux/system.gyp:udev',
             '../device/media_transfer_protocol/media_transfer_protocol.gyp:mtp_file_entry_proto',
             '../device/media_transfer_protocol/media_transfer_protocol.gyp:mtp_storage_info_proto',
             '../device/media_transfer_protocol/media_transfer_protocol.gyp:device_media_transfer_protocol',
           ],
         }],
         ['OS=="linux" and chromeos==0', {
           'dependencies': [
             '../build/linux/system.gyp:libspeechd',
           ],
         }],
@@ skipping 448 matching lines @@
             'package_name': 'org/chromium/chrome/browser',
             'template_deps': ['browser/android/tab_load_status.h'],
           },
           'includes': [ '../build/android/java_cpp_template.gypi' ],
         },
       ],
      },
     ],
   ],
 }