Revert of Switch to standard integer types in sandbox/.

sandbox/linux/suid/client/setuid_sandbox_host.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/suid/client/setuid_sandbox_host.h"
 
 #include <fcntl.h>
-#include <stddef.h>
 #include <stdlib.h>
 #include <sys/stat.h>
 #include <unistd.h>
 
 #include <string>
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/environment.h"
 #include "base/files/file_path.h"
@@ skipping 168 matching lines @@
   // kZygoteIdFd. Fixing this requires a sandbox API change. :(
   fds_to_remap->push_back(std::make_pair(dummy_fd->get(), kZygoteIdFd));
 }
 
 void SetuidSandboxHost::SetupLaunchEnvironment() {
   SaveSUIDUnsafeEnvironmentVariables(env_.get());
   SetSandboxAPIEnvironmentVariable(env_.get());
 }
 
 }  // namespace sandbox