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

sandbox/linux/seccomp/syscall_table.h

-// 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.
-
-#ifndef SYSCALL_TABLE_H__
-#define SYSCALL_TABLE_H__
-
-#include <sys/types.h>
-
-#ifdef __cplusplus
-#include "securemem.h"
-extern "C" {
-namespace playground {
-#define SecureMemArgs SecureMem::Args
-#else
-#define SecureMemArgs void
-#define bool          int
-#endif
-  #define UNRESTRICTED_SYSCALL ((void *)1)
-
-  struct SyscallTable {
-    void   *handler;
-    bool  (*trustedProcess)(int parentMapsFd, int sandboxFd, int threadFdPub,
-                            int threadFd, SecureMemArgs* mem);
-  };
-  extern const struct SyscallTable syscallTable[]
-    asm("playground$syscallTable")
-#if defined(__x86_64__)
-    __attribute__((visibility("internal")))
-#endif
-    ;
-  extern const unsigned maxSyscall
-    asm("playground$maxSyscall")
-#if defined(__x86_64__)
-    __attribute__((visibility("internal")))
-#endif
-    ;
-#ifdef __cplusplus
-} // namespace
-}
-#endif
-
-#endif // SYSCALL_TABLE_H__