[NaCl SDK] Add nacl_io and sdk_util namespaces.

native_client_sdk/src/libraries/nacl_io/mount_node_dir.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_node_dir.h"
 
 #include <errno.h>
 #include <string.h>
 
 #include "nacl_io/osdirent.h"
 #include "nacl_io/osstat.h"
 #include "sdk_util/auto_lock.h"
 #include "sdk_util/macros.h"
 
+namespace nacl_io {
+
 MountNodeDir::MountNodeDir(Mount* mount) : MountNode(mount), cache_(NULL) {
   stat_.st_mode |= S_IFDIR;
 }
 
 MountNodeDir::~MountNodeDir() {
   for (MountNodeMap_t::iterator it = map_.begin(); it != map_.end(); ++it) {
     it->second->Unlink();
   }
   free(cache_);
 }
@@ skipping 111 matching lines @@
       size_t len = it->first.length();
       cache_[index].d_ino = it->second->stat_.st_ino;
       cache_[index].d_off = sizeof(struct dirent);
       cache_[index].d_reclen = sizeof(struct dirent);
       cache_[index].d_name[len] = 0;
       strncpy(cache_[index].d_name, &it->first[0], len);
     }
   }
 }
 
+}  // namespace nacl_io
+