ozone: //sandbox: clean up from USE_X11

This is another CL that removes USE_X11 define and
gn arg usage from //sandbox.

Bug: 1096425
Change-Id: I1abd789a707c8ae65c4afd6591c0531b852c8383
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3257554
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Maksim Sisov <msisov@igalia.com>
Cr-Commit-Position: refs/heads/main@{#937847}
NOKEYCHECK=True
GitOrigin-RevId: 8d9e28e87b31666ee06a53ab2eb55bc4a5348bcb
diff --git a/policy/linux/bpf_gpu_policy_linux.cc b/policy/linux/bpf_gpu_policy_linux.cc
index 51eaf73..295de5d 100644
--- a/policy/linux/bpf_gpu_policy_linux.cc
+++ b/policy/linux/bpf_gpu_policy_linux.cc
@@ -101,7 +101,7 @@
       break;
   }
 
-#if (defined(OS_LINUX) || BUILDFLAG(IS_CHROMEOS_LACROS)) && defined(USE_X11)
+#if defined(OS_LINUX) || BUILDFLAG(IS_CHROMEOS_LACROS)
   if (SyscallSets::IsSystemVSharedMemory(sysno))
     return Allow();
 #endif