[NaCl SDK] rename nacl_io demo.

native_client_sdk/src/examples/demo/nacl_io_demo/queue.c

 /* 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 "queue.h"
 
 #include <pthread.h>
 #include <stdlib.h>
 
@@ skipping 92 matching lines @@
   }
 
   message = g_queue[g_queue_start];
   g_queue_start = (g_queue_start + 1) % MAX_QUEUE_SIZE;
   g_queue_size--;
 
   pthread_mutex_unlock(&g_queue_mutex);
 
   return message;
 }