Remove xdisplaycheck

tools/mb/mb_unittest.py

 #!/usr/bin/python
 # Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 """Tests for mb.py."""
@@ skipping 511 matching lines @@
     files = isolate_file_contents['variables']['files']
     command = isolate_file_contents['variables']['command']
 
     self.assertEqual(files, [
         '../../testing/test_env.py',
         '../../testing/xvfb.py',
         '../../third_party/gtest-parallel/gtest-parallel',
         '../../third_party/gtest-parallel/gtest-parallel-wrapper.py',
         'base_unittests',
         'some_resource_file',
-        'xdisplaycheck',
     ])
     self.assertEqual(command, [
         '../../testing/xvfb.py',
         '.',
         '../../third_party/gtest-parallel/gtest-parallel-wrapper.py',
         './base_unittests',
         '--',
         '--asan=0',
         '--msan=0',
         '--tsan=0',
@@ skipping 291 matching lines @@
     self.check(['lookup', '-c', 'fake_config'], mbw=mbw,
                ret=0,
                out=("GYP_DEFINES='foo=bar baz=1'\n"
                     "GYP_LINK_CONCURRENCY=1\n"
                     "LLVM_FORCE_HEAD_REVISION=1\n"
                     "python build/gyp_chromium -G output_dir=_path_\n"))
 
 
 if __name__ == '__main__':
   unittest.main()