[NaCl SDK] Add nacl_io and sdk_util namespaces.

native_client_sdk/src/libraries/nacl_io/mount_node_html5fs.h

 /* 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.
  */
 #ifndef LIBRARIES_NACL_IO_MOUNT_HTML5FS_NODE_H_
 #define LIBRARIES_NACL_IO_MOUNT_HTML5FS_NODE_H_
 
 #include <ppapi/c/pp_resource.h>
 #include "nacl_io/mount_node.h"
 
+namespace nacl_io {
+
 class MountHtml5Fs;
 
 class MountNodeHtml5Fs : public MountNode {
  public:
   // Normal OS operations on a node (file), can be called by the kernel
   // directly so it must lock and unlock appropriately.  These functions
   // must not be called by the mount.
   virtual Error FSync();
   virtual Error GetDents(size_t offs,
                          struct dirent* pdir,
@@ skipping 21 matching lines @@
   PP_Resource fileio_resource_;  // 0 if the file is a directory.
 
   // Returns true if this node is a directory.
   bool IsDirectory() const {
     return !fileio_resource_;
   }
 
   friend class MountHtml5Fs;
 };
 
+}  // namespace nacl_io
+
 #endif  // LIBRARIES_NACL_IO_MOUNT_HTML5FS_NODE_H_