Remove xdisplaycheck from the tree

media/midi/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/android/config.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//media/media_options.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//testing/test.gni")
@@ skipping 191 matching lines @@
 
   if (is_mac) {
     sources += [ "midi_manager_mac_unittest.cc" ]
     libs = [ "CoreMIDI.framework" ]
   }
 
   if (use_alsa && use_udev) {
     sources += [ "midi_manager_alsa_unittest.cc" ]
   }
 
-  if (use_x11) {
-    deps += [ "//tools/xdisplaycheck" ]
-  }
-
   # This target should not require the Chrome executable to run.
   assert_no_deps = [ "//chrome" ]
 }