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

chrome/nacl/nacl_main_platform_delegate_linux.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 "chrome/nacl/nacl_main_platform_delegate.h"
 
 #include "base/command_line.h"
 #include "base/debug_util.h"
-#include "sandbox/linux/seccomp/sandbox.h"
+#include "seccompsandbox/sandbox.h"
 
 #include "chrome/common/chrome_switches.h"
 
 NaClMainPlatformDelegate::NaClMainPlatformDelegate(
     const MainFunctionParams& parameters)
         : parameters_(parameters), sandbox_test_module_(NULL) {
 }
 
 NaClMainPlatformDelegate::~NaClMainPlatformDelegate() {
 }
@@ skipping 24 matching lines @@
     StartSeccompSandbox();
 #endif
   return true;
 }
 
 void NaClMainPlatformDelegate::RunSandboxTests() {
   // The sandbox is started in the zygote process: zygote_main_linux.cc
   // http://code.google.com/p/chromium/wiki/LinuxSUIDSandbox
 }