[NaCl SDK] Add nacl_io and sdk_util namespaces.

native_client_sdk/src/libraries/nacl_io/mount_mem.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_MEM_H_
 #define LIBRARIES_NACL_IO_MOUNT_MEM_H_
 
 #include "nacl_io/mount.h"
 #include "nacl_io/typed_mount_factory.h"
 
+namespace nacl_io {
+
 class MountMem : public Mount {
  protected:
   MountMem();
 
   virtual Error Init(int dev, StringMap_t& args, PepperInterface* ppapi);
 
   // The protected functions are only used internally and will not
   // acquire or release the mount's lock themselves.  The caller is
   // required to use correct locking as needed.
 
@@ skipping 18 matching lines @@
   static const int REMOVE_ALL = REMOVE_DIR | REMOVE_FILE;
 
   Error RemoveInternal(const Path& path, int remove_type);
 
   ScopedMountNode root_;
 
   friend class TypedMountFactory<MountMem>;
   DISALLOW_COPY_AND_ASSIGN(MountMem);
 };
 
+}  // namespace nacl_io
+
 #endif  // LIBRARIES_NACL_IO_MOUNT_MEM_H_