GTK: Improve xfce detection.

base/base.gyp

 # Copyright (c) 2009 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,
   },
   'includes': [
     'base.gypi',
@@ skipping 152 matching lines @@
         'base_i18n',
         '../testing/gmock.gyp:gmock',
         '../testing/gtest.gyp:gtest',
       ],
       'conditions': [
         ['OS == "linux" or OS == "freebsd" or OS == "openbsd" or OS == "solaris"', {
           'sources!': [
             'file_version_info_unittest.cc',
             'worker_pool_linux_unittest.cc',
           ],
+          'sources': [
+            'linux_util_unittest.cc',
+          ],
           'dependencies': [
             '../build/linux/system.gyp:gtk',
             '../build/linux/system.gyp:nss',
             '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
           ],
         }, {  # OS != "linux" and OS != "freebsd" and OS != "openbsd" and OS != "solaris"
           'sources!': [
             'message_pump_glib_unittest.cc',
           ]
         }],
@@ skipping 86 matching lines @@
       ],
     }],
   ],
 }
 
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