Move thread_pool.h into utils so it can be shared by more than one example.

native_client_sdk/src/libraries/nacl_io/kernel_object.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 "nacl_io/kernel_object.h"
 
 #include <assert.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <pthread.h>
 
 #include <algorithm>
 #include <map>
 #include <string>
 #include <vector>
 
 #include "nacl_io/kernel_handle.h"
 #include "nacl_io/mount.h"
 #include "nacl_io/mount_node.h"
-#include "utils/auto_lock.h"
+#include "sdk_util/auto_lock.h"
 
 KernelObject::KernelObject() {
   pthread_mutex_init(&kernel_lock_, NULL);
   pthread_mutex_init(&process_lock_, NULL);
 }
 
 KernelObject::~KernelObject() {
   pthread_mutex_destroy(&process_lock_);
   pthread_mutex_destroy(&kernel_lock_);
 }
@@ skipping 143 matching lines @@
   Path abs_path(cwd_);
   if (path[0] == '/') {
     abs_path = path;
   } else {
     abs_path = cwd_;
     abs_path.Append(path);
   }
 
   return abs_path;
 }