[NaCl SDK] Consistent use of copyright header.

native_client_sdk/src/libraries/nacl_io/mount_node.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.
- */
+// 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_node.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <string.h>
 #include <sys/stat.h>
 
 #include <algorithm>
 #include <string>
 
@@ skipping 127 matching lines @@
   out_node->reset(NULL);
   return ENOTDIR;
 }
 
 int MountNode::ChildCount() { return 0; }
 
 void MountNode::Link() { stat_.st_nlink++; }
 
 void MountNode::Unlink() { stat_.st_nlink--; }