[NaCl SDK] Add nacl_io and sdk_util namespaces.

native_client_sdk/src/libraries/nacl_io/inode_pool.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_INODE_POOL_H_
 #define LIBRARIES_NACL_IO_INODE_POOL_H_
 
 #include <stdlib.h>
 #include <vector>
 
 #include "nacl_io/osstat.h"
 #include "pthread.h"
 #include "sdk_util/auto_lock.h"
 
+namespace nacl_io {
 
 class INodePool {
  public:
   INodePool() : max_nodes_(0), num_nodes_(0) {}
 
   ino_t Acquire() {
     AUTO_LOCK(lock_);
     const int INO_CNT = 8;
 
     // If we run out of INO numbers, then allocate 8 more
@@ skipping 19 matching lines @@
     num_nodes_--;
   }
 
   size_t size() const { return num_nodes_; }
   size_t capacity() const { return max_nodes_; }
 
  private:
   size_t num_nodes_;
   size_t max_nodes_;
   std::vector<ino_t> inos_;
-  SimpleLock lock_;
+  sdk_util::SimpleLock lock_;
 };
 
+}  // namespace nacl_io
+
 #endif  // LIBRARIES_NACL_IO_INODE_POOL_H_