Use Xvfb in isolated testing only if use_x11 is set

ui/app_list/app_list_unittests.isolate

 # Copyright (c) 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.
 {
   'conditions': [
     ['OS=="linux" or OS=="mac" or OS=="win"', {
       'variables': {
         'files': [
           '../../testing/test_env.py',
           '<(PRODUCT_DIR)/app_list_unittests<(EXECUTABLE_SUFFIX)',
           '<(PRODUCT_DIR)/ui_test.pak',
         ],
       },
     }],
-    ['OS=="linux"', {
+    ['OS=="linux" and use_x11==1', {
       'variables': {
         'command': [
           '../../testing/xvfb.py',
           '<(PRODUCT_DIR)',
           '<(PRODUCT_DIR)/app_list_unittests<(EXECUTABLE_SUFFIX)',
           '--brave-new-test-launcher',
           '--test-launcher-bot-mode',
           '--asan=<(asan)',
           '--lsan=<(lsan)',
         ],
         'files': [
           '../../testing/xvfb.py',
+          '<(PRODUCT_DIR)/xdisplaycheck<(EXECUTABLE_SUFFIX)',
+        ],
+      },
+    }],
+    ['OS=="linux"', {
+      'variables': {
+        'files': [
           '<(PRODUCT_DIR)/libosmesa.so',
         ],
       },
     }],
-    ['OS=="linux" and use_ozone==0', {
-      'variables': {
-        'files': [
-          '<(PRODUCT_DIR)/xdisplaycheck<(EXECUTABLE_SUFFIX)',
-        ],
-      },
-    }],
     ['OS=="mac"', {
       'variables': {
         'files': [
           '<(PRODUCT_DIR)/osmesa.so',
         ],
       },
     }],
     ['OS=="win"', {
       'variables': {
         'files': [
           '<(PRODUCT_DIR)/osmesa.dll',
         ],
       },
     }],
-    ['OS=="mac" or OS=="win"', {
+    ['OS=="mac" or OS=="win" or use_ozone==1', {
       'variables': {
         'command': [
           '../../testing/test_env.py',
           '<(PRODUCT_DIR)/app_list_unittests<(EXECUTABLE_SUFFIX)',
           '--brave-new-test-launcher',
           '--test-launcher-bot-mode',
           '--asan=<(asan)',
           '--lsan=<(lsan)',
         ],
       },
     }],
   ],
   'includes': [
     '../../base/base.isolate',
   ],
 }