[NaCl SDK] Add nacl_io and sdk_util namespaces.

native_client_sdk/src/libraries/nacl_io/mount_node_dir.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_NODE_DIR_H_
 #define LIBRARIES_NACL_IO_MOUNT_NODE_DIR_H_
 
 #include <map>
 #include <string>
 
 #include "nacl_io/mount_node.h"
 
-struct dirent;
+namespace nacl_io {
 
 class MountDev;
 class MountHtml5Fs;
 class MountHttp;
 class MountMem;
 class MountNodeDir;
 
-typedef ScopedRef<MountNodeDir> ScopedMountNodeDir;
+typedef sdk_util::ScopedRef<MountNodeDir> ScopedMountNodeDir;
 
 class MountNodeDir : public MountNode {
  protected:
   explicit MountNodeDir(Mount* mnt);
   virtual ~MountNodeDir();
 
  public:
   typedef std::map<std::string, ScopedMountNode> MountNodeMap_t;
 
   virtual Error FTruncate(off_t size);
@@ skipping 18 matching lines @@
 private:
   struct dirent* cache_;
   MountNodeMap_t map_;
 
   friend class MountDev;
   friend class MountMem;
   friend class MountHttp;
   friend class MountHtml5Fs;
 };
 
+}  // namespace nacl_io
+
 #endif  // LIBRARIES_NACL_IO_MOUNT_NODE_DIR_H_