Pull seccomp-sandbox in via DEPS rather than using an in-tree copy...

sandbox/linux/seccomp/exit.cc

-// Copyright (c) 2010 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 "debug.h"
-#include "sandbox_impl.h"
-
-namespace playground {
-
-long Sandbox::sandbox_exit(int status) {
-  long long tm;
-  Debug::syscall(&tm, __NR_exit, "Executing handler");
-  struct {
-    int       sysnum;
-    long long cookie;
-  } __attribute__((packed)) request;
-  request.sysnum = __NR_exit;
-  request.cookie = cookie();
-
-  SysCalls sys;
-  if (write(sys, processFdPub(), &request, sizeof(request)) !=
-      sizeof(request)) {
-    die("Failed to forward exit() request [sandbox]");
-  }
-  for (;;) {
-    sys._exit(status);
-  }
-}
-
-bool Sandbox::process_exit(int parentMapsFd, int sandboxFd, int threadFdPub,
-                           int threadFd, SecureMem::Args* mem) {
-  SecureMem::lockSystemCall(parentMapsFd, mem);
-  SecureMem::sendSystemCall(threadFdPub, true, parentMapsFd, mem,
-                            __NR_exit, 0);
-  return true;
-}
-
-} // namespace