Update to use third_party/webrtc_overrides instead of third_party/webrtc/overrides.

third_party/libjingle/libjingle_nacl.gyp

 # Copyright 2014 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': {
     'libjingle_source': "source",
     'webrtc_base': "../webrtc/base",
     'webrtc_xmllite': "../webrtc/libjingle/xmllite",
     'webrtc_p2p': "../webrtc/p2p",
@@ skipping 253 matching lines @@
           'sources/': [
             ['exclude', '/win[a-z0-9]+\\.(h|cc)$'],
             ['exclude', '/schanneladapter\\.(h|cc)$'],
           ],
         }],
       ],
       'direct_dependent_settings': {
         'include_dirs': [
           './overrides',
           './<(libjingle_source)',
-          '../../third_party/webrtc/overrides',
+          '../../third_party/webrtc_overrides',
           '../../third_party',
           '../../third_party/webrtc',
         ],
         'defines': [
           'EXPAT_RELATIVE_PATH',
           'FEATURE_ENABLE_SSL',
           'GTEST_RELATIVE_PATH',
           'NO_MAIN_THREAD_WRAPPING',
           'NO_SOUND_SYSTEM',
           'WEBRTC_POSIX',
@@ skipping 30 matching lines @@
         './<(libjingle_source)',
         '../'
       ],
       'sources': [
         '<(webrtc_p2p)/base/constants.cc',
         '<(webrtc_p2p)/base/constants.h',
       ],
     },  # end of target 'libjingle_p2p_constants_nacl'
   ],
 }