use_x11==1 is a better condition for xdisplaycheck dep

cc/cc_tests.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
     'cc_unit_tests_source_files': [
       'animation/animation_host_unittest.cc',
       'animation/animation_player_unittest.cc',
@@ skipping 450 matching lines @@
           ],
           'includes': [
             '../build/isolate.gypi',
           ],
           'sources': [
             'cc_unittests.isolate',
           ],
           'conditions': [
             # crbug.com/464062 xdisplaycheck is used to run cc_unittests_run on
             # the linux try bots when using X11.
-            ['OS=="linux" and use_ozone==0',
+            ['use_x11==1',
               {
                 'dependencies': [
                   '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
                 ],
               }
             ],
           ],
         },
       ],
     }],
   ],
 }