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

native_client_sdk/src/libraries/nacl_io/mount_mem.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/mount_mem.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <string>
 
 #include "nacl_io/mount.h"
 #include "nacl_io/mount_node.h"
 #include "nacl_io/mount_node_dir.h"
 #include "nacl_io/mount_node_mem.h"
 #include "nacl_io/osstat.h"
 #include "nacl_io/path.h"
-#include "utils/auto_lock.h"
-#include "utils/ref_object.h"
+#include "sdk_util/auto_lock.h"
+#include "sdk_util/ref_object.h"
 
 // TODO(noelallen) : Grab/Redefine these in the kernel object once available.
 #define USR_ID 1002
 #define GRP_ID 1003
 
 MountMem::MountMem()
     : root_(NULL),
       max_ino_(0) {
 }
 
@@ skipping 213 matching lines @@
   if (file_only && child->IsaDir()) {
     errno = EISDIR;
     return -1;
   }
   if (remove_dir && child->ChildCount() > 0) {
     errno = ENOTEMPTY;
     return -1;
   }
   return parent->RemoveChild(path.Basename());
 }