[NaCl SDK] Add nacl_io and sdk_util namespaces.

native_client_sdk/src/libraries/nacl_io/mount.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.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <string>
 
 #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 "sdk_util/auto_lock.h"
 #include "sdk_util/ref_object.h"
 
 #if defined(WIN32)
 #include <windows.h>
 #endif
 
+namespace nacl_io {
+
 Mount::Mount() : dev_(0) {}
 
 Mount::~Mount() {}
 
 Error Mount::Init(int dev, StringMap_t& args, PepperInterface* ppapi) {
   dev_ = dev;
   ppapi_ = ppapi;
   return 0;
 }
 
@@ skipping 20 matching lines @@
 void Mount::OnNodeCreated(MountNode* node) {
   node->stat_.st_ino = inode_pool_.Acquire();
   node->stat_.st_dev = dev_;
 }
 
 void Mount::OnNodeDestroyed(MountNode* node) {
   if (node->stat_.st_ino)
     inode_pool_.Release(node->stat_.st_ino);
 }
 
+}  // namespace nacl_io
+