Revert of Switch to standard integer types in sandbox/.

sandbox/win/src/win2k_threadpool.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/win/src/win2k_threadpool.h"
 
-#include <stddef.h>
-
 #include "sandbox/win/src/win_utils.h"
 
 namespace sandbox {
 
 Win2kThreadPool::Win2kThreadPool() {
   ::InitializeCriticalSection(&lock_);
 }
 
 bool Win2kThreadPool::RegisterWait(const void* cookie, HANDLE waitable_object,
                                    CrossCallIPCCallback callback,
@@ skipping 38 matching lines @@
 }
 
 Win2kThreadPool::~Win2kThreadPool() {
   // Here we used to unregister all the pool wait handles. Now, following the
   // rest of the code we avoid lengthy or blocking calls given that the process
   // is being torn down.
   ::DeleteCriticalSection(&lock_);
 }
 
 }  // namespace sandbox