Disable the failing Trap.SigSysAction test under TSan.

sandbox/linux/seccomp-bpf/trap_unittest.cc

Index: sandbox/linux/seccomp-bpf/trap_unittest.cc
diff --git a/sandbox/linux/seccomp-bpf/trap_unittest.cc b/sandbox/linux/seccomp-bpf/trap_unittest.cc
index 99f94bfb3a499e603b1b5dbd3db845261886cf92..3d95e3463ba75d85fff28f142c0666a2271471c9 100644
--- a/sandbox/linux/seccomp-bpf/trap_unittest.cc
+++ b/sandbox/linux/seccomp-bpf/trap_unittest.cc
@@ -12,6 +12,7 @@
 namespace sandbox {
 namespace {
 
+#if !defined(THREAD_SANITIZER)
 SANDBOX_TEST_ALLOW_NOISE(Trap, SigSysAction) {
   // This creates a global Trap instance, and registers the signal handler
   // (Trap::SigSysAction).
@@ -23,6 +24,7 @@ SANDBOX_TEST_ALLOW_NOISE(Trap, SigSysAction) {
   // "Unexpected SIGSYS received." so it is necessary to allow the noise.
   raise(SIGSYS);
 }
+#endif
 
 }  // namespace
 }  // namespace sandbox