Remove xdisplaycheck

The tool is no longer needed and will be removed in Chromium.

BUG=chromium:670470

Review-Url: https://codereview.webrtc.org/2548763002
Cr-Commit-Position: refs/heads/master@{#15384}

setup_links.py

@@ -81,7 +81,6 @@ DIRECTORIES = [
   'tools/valgrind',
   'tools/vim',
   'tools/win',
-  'tools/xdisplaycheck',
 ]
 
 from sync_chromium import get_target_os_list

tools/mb/mb.py

@@ -1106,7 +1106,6 @@ class MetaBuildWrapper(object):
       xvfb = use_x11 and test_type == 'windowed_test_launcher'
       if xvfb:
         extra_files += [
-            'xdisplaycheck',
             '../../testing/xvfb.py',
         ]
 

tools/mb/mb_unittest.py

@@ -529,7 +529,6 @@ class UnitTest(unittest.TestCase):
         '../../third_party/gtest-parallel/gtest-parallel-wrapper.py',
         'base_unittests',
         'some_resource_file',
-        'xdisplaycheck',
     ])
     self.assertEqual(command, [
         '../../testing/xvfb.py',

webrtc/test/BUILD.gn

@@ -148,10 +148,6 @@ rtc_source_set("test_support") {
     configs += [ "//build/config/compiler:enable_arc" ]
   }
 
-  if (use_x11) {
-    deps += [ "//tools/xdisplaycheck" ]
-  }
-
   if (is_android) {
     deps += [ "//base:base" ]
     data = [