Fix ChromeOS Ozone build since it doesn't have xdisplaycheck.

chrome/unit_tests.isolate

 # Copyright (c) 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.
 {
   'conditions': [
     ['OS=="android" or OS=="linux"', {
       'variables': {
         'isolate_dependency_untracked': [
           '<(PRODUCT_DIR)/test_data/',
         ],
@@ skipping 33 matching lines @@
           '<(PRODUCT_DIR)',
           '<(PRODUCT_DIR)/unit_tests<(EXECUTABLE_SUFFIX)',
           '--brave-new-test-launcher',
           '--test-launcher-bot-mode',
         ],
         'isolate_dependency_tracked': [
           '../testing/xvfb.py',
           '<(PRODUCT_DIR)/libffmpegsumo.so',
           '<(PRODUCT_DIR)/libosmesa.so',
           '<(PRODUCT_DIR)/locales/fr.pak',
+        ],
+      },
+    }],
+    ['OS=="linux" and use_ozone==0', {
+      'variables': {
+        'isolate_dependency_tracked': [
           '<(PRODUCT_DIR)/xdisplaycheck<(EXECUTABLE_SUFFIX)',
         ],
       },
     }],
     ['OS=="linux" or OS=="mac" or OS=="win"', {
       'variables': {
         'isolate_dependency_tracked': [
           '../testing/test_env.py',
           '<(PRODUCT_DIR)/unit_tests<(EXECUTABLE_SUFFIX)',
         ],
@@ skipping 69 matching lines @@
         'isolate_dependency_untracked': [
           '../chromeos/test/data/network/',
         ],
       },
     }],
   ],
   'includes': [
     '../base/base.isolate',
   ],
 }