Remove xdisplaycheck from the tree

content/shell/BUILD.gn

Index: content/shell/BUILD.gn
diff --git a/content/shell/BUILD.gn b/content/shell/BUILD.gn
index ad98ab15e3a4f5aa3db8b13171951f88107bb8dd..2400fd203400e6d7e8e55b62646615b8bb64b6a5 100644
--- a/content/shell/BUILD.gn
+++ b/content/shell/BUILD.gn
@@ -308,10 +308,6 @@ static_library("content_shell_lib") {
   if (use_x11) {
     # Some tests rely on this tool at runtime. Note: it might be better if
     # the tests that needed it had this as a dep instead of adding it here.
-    data_deps = [
-      "//tools/xdisplaycheck",
-    ]
-
     deps += [ "//ui/events/devices/x11" ]
   }