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

native_client_sdk/src/libraries/nacl_io/kernel_proxy.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_proxy.h"
 
 #include <assert.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <pthread.h>
 #include <string.h>
 #include <iterator>
 #include <string>
 
 #include "nacl_io/kernel_handle.h"
 #include "nacl_io/kernel_wrap_real.h"
 #include "nacl_io/mount.h"
 #include "nacl_io/mount_dev.h"
 #include "nacl_io/mount_html5fs.h"
 #include "nacl_io/mount_http.h"
 #include "nacl_io/mount_mem.h"
 #include "nacl_io/mount_node.h"
 #include "nacl_io/mount_passthrough.h"
 #include "nacl_io/osmman.h"
 #include "nacl_io/osstat.h"
 #include "nacl_io/path.h"
 #include "nacl_io/pepper_interface.h"
-#include "utils/auto_lock.h"
-#include "utils/ref_object.h"
+#include "sdk_util/auto_lock.h"
+#include "sdk_util/ref_object.h"
 
 #ifndef MAXPATHLEN
 #define MAXPATHLEN 256
 #endif
 
 // TODO(noelallen) : Grab/Redefine these in the kernel object once available.
 #define USR_ID 1002
 #define GRP_ID 1003
 
 
@@ skipping 488 matching lines @@
 
   KernelHandle* handle = new KernelHandle(mnt, node, O_RDONLY);
   int fd = AllocateFD(handle);
   mnt->AcquireNode(node);
 
   ReleaseHandle(handle);
   ReleaseMount(mnt);
 
   return fd;
 }