Enable PPB_DirectoryReader_Dev under NaCl

ppapi/ppapi_shared.gypi

 # 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.
 
 {
   'variables': {
     'conditions': [
       ['inside_chromium_build==0', {
         'webkit_src_dir': '../../../..',
       },{
@@ skipping 263 matching lines @@
               'shared_impl/private/ppb_browser_font_trusted_shared.cc',
               'shared_impl/private/ppb_char_set_shared.cc',
               'thunk/ppb_audio_input_dev_thunk.cc',
               'thunk/ppb_audio_trusted_thunk.cc',
               'thunk/ppb_broker_thunk.cc',
               'thunk/ppb_browser_font_trusted_thunk.cc',
               'thunk/ppb_buffer_thunk.cc',
               'thunk/ppb_buffer_trusted_thunk.cc',
               'thunk/ppb_content_decryptor_private_thunk.cc',
               'thunk/ppb_char_set_thunk.cc',
-              'thunk/ppb_directory_reader_thunk.cc',
               'thunk/ppb_file_io_trusted_thunk.cc',
               'thunk/ppb_flash_clipboard_thunk.cc',
               'thunk/ppb_flash_device_id_thunk.cc',
               'thunk/ppb_flash_file_fileref_thunk.cc',
               'thunk/ppb_flash_file_modulelocal_thunk.cc',
               'thunk/ppb_flash_font_file_thunk.cc',
               'thunk/ppb_flash_fullscreen_thunk.cc',
               'thunk/ppb_flash_menu_thunk.cc',
               'thunk/ppb_flash_message_loop_thunk.cc',
               'thunk/ppb_flash_thunk.cc',
@@ skipping 30 matching lines @@
               'thunk/ppb_tcp_socket_private_thunk.cc',
               'thunk/ppb_udp_socket_private_thunk.cc',
               'thunk/ppb_x509_certificate_private_thunk.cc',
             ],
           }],
         ],
       }],
     ],
   },
 }