Revert of Switch to standard integer types in sandbox/.

sandbox/linux/syscall_broker/broker_process_unittest.cc

 // Copyright (c) 2012 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/syscall_broker/broker_process.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <poll.h>
-#include <stddef.h>
 #include <sys/resource.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <unistd.h>
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 627 matching lines @@
     ssize_t len = HANDLE_EINTR(read(fd_check, buf, sizeof(buf)));
 
     ASSERT_EQ(len, static_cast<ssize_t>(sizeof(kTestText)));
     ASSERT_EQ(memcmp(kTestText, buf, sizeof(kTestText)), 0);
   }
 }
 
 }  // namespace syscall_broker
 
 }  // namespace sandbox