Remove xdisplaycheck from the tree

components/exo/BUILD.gn

 # Copyright 2015 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.
 
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 
 source_set("exo") {
   sources = [
     "buffer.cc",
@@ skipping 144 matching lines @@
     "//base/test:test_support",
     "//device/gamepad:test_helpers",
   ]
 
   data_deps = [
     "//ash/common/strings:ash_test_strings",
     "//ash/resources:ash_test_resources_100_percent",
     "//ash/resources:ash_test_resources_200_percent",
   ]
 
-  if (use_x11) {
-    deps += [ "//tools/xdisplaycheck" ]
-  }
-
   if (is_linux) {
     deps += [ "//components/exo/wayland:unit_tests" ]
   }
 }