Enable building with Native Client.

setup_links.py

 #!/usr/bin/env python
 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 """Setup links to a Chromium checkout for WebRTC.
@@ skipping 17 matching lines @@
 import shutil
 import subprocess
 import sys
 import textwrap
 
 
 DIRECTORIES = [
   'build',
   'buildtools',
   'google_apis',  # Needed by build/common.gypi.
+  'native_client',
   'net',
   'testing',
   'third_party/binutils',
   'third_party/boringssl',
   'third_party/colorama',
   'third_party/drmemory',
   'third_party/expat',
   'third_party/icu',
   'third_party/instrumented_libraries',
   'third_party/jsoncpp',
@@ skipping 462 matching lines @@
   except LinkError as e:
     print >> sys.stderr, e.message
     return 3
   finally:
     links_database.close()
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main())