webrtc: Remove dependency on xdisplaycheck

webrtc/test/BUILD.gn

Index: webrtc/test/BUILD.gn
diff --git a/webrtc/test/BUILD.gn b/webrtc/test/BUILD.gn
index 1b3c05973ac7c1a17ee9e69c389e4b43893afbcb..809274f7b741f7ce58e911504c2f695ad01b9c13 100644
--- a/webrtc/test/BUILD.gn
+++ b/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 = [