Revert of Run gl_unittests with Ozone X11.

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index facd4ff63c5b510686d7e6d01016a0de3ec8cf85..f589a3ac30bf27822553498bb5e08da5b3853888 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -18,7 +18,6 @@
 import("//remoting/remoting_enable.gni")
 import("//third_party/openh264/openh264_args.gni")
 import("//tools/ipc_fuzzer/ipc_fuzzer.gni")
-import("//ui/ozone/ozone.gni")
 import("//v8/gni/v8.gni")
 import("//v8/snapshot_toolchain.gni")
 
@@ -374,7 +373,7 @@
     ]
   }
 
-  if (use_x11 || ozone_platform_x11) {
+  if (use_x11) {
     deps += [ "//tools/xdisplaycheck" ]
   }