Disable the failing Trap.SigSysAction test under TSan.

sandbox/linux/seccomp-bpf/trap_unittest.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "sandbox/linux/seccomp-bpf/trap.h"
 
 #include <signal.h>
 
 #include "sandbox/linux/tests/unit_tests.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 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).
   Trap::Registry();
 
   // Send SIGSYS to self. If signal handler (SigSysAction) is not registered,
   // the process will be terminated with status code -SIGSYS.
   // Note that, SigSysAction handler would output an error message
   // "Unexpected SIGSYS received." so it is necessary to allow the noise.
   raise(SIGSYS);
 }
+#endif
 
 }  // namespace
 }  // namespace sandbox