Linux sandbox: allow sigaltstack in Android baseline policy.

sandbox/linux/seccomp-bpf-helpers/baseline_policy.cc

Index: sandbox/linux/seccomp-bpf-helpers/baseline_policy.cc
diff --git a/sandbox/linux/seccomp-bpf-helpers/baseline_policy.cc b/sandbox/linux/seccomp-bpf-helpers/baseline_policy.cc
index 913d4f691b8e5a290ffacef9ba48d198c6ac265a..45de129e24be031c0a2e729f2a8e07af31e56572 100644
--- a/sandbox/linux/seccomp-bpf-helpers/baseline_policy.cc
+++ b/sandbox/linux/seccomp-bpf-helpers/baseline_policy.cc
@@ -120,10 +120,9 @@ ResultExpr EvaluateSyscallImpl(int fs_denied_errno,
     return Allow();
   }
 
-#if defined(__aarch64__)
-  // These are needed for thread creation.
-  // TODO(leecam): Check jln's fix for this and remove these 'allows'.
-  if (sysno == __NR_sigaltstack || sysno == __NR_setpriority)
+#if defined(OS_ANDROID)
+  // Needed for thread creation.
+  if (sysno == __NR_sigaltstack)
     return Allow();
 #endif