Remove unused libpeerconnection code.

third_party/libjingle/libjingle.gyp

 # 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.
 
 {
   'includes': [
     '../../build/win_precompile.gypi',
   ],
   'variables': {
     'enabled_libjingle_device_manager%': 0,
@@ skipping 311 matching lines @@
     ['enable_webrtc==1', {
       'targets': [
         {
           # GN version: //third_party/libjingle:libjingle_webrtc_common
           'target_name': 'libjingle_webrtc_common',
           'type': 'static_library',
           'all_dependent_settings': {
             'defines': [ 'LIBPEERCONNECTION_LIB=1' ],
           },
           'sources': [
-            'overrides/talk/media/webrtc/webrtcexport.h',
-
             '<(libjingle_source)/talk/app/webrtc/audiotrack.cc',
             '<(libjingle_source)/talk/app/webrtc/audiotrack.h',
             '<(libjingle_source)/talk/app/webrtc/audiotrackrenderer.cc',
             '<(libjingle_source)/talk/app/webrtc/audiotrackrenderer.h',
             '<(libjingle_source)/talk/app/webrtc/datachannel.cc',
             '<(libjingle_source)/talk/app/webrtc/datachannel.h',
             '<(libjingle_source)/talk/app/webrtc/dtlsidentityservice.cc',
             '<(libjingle_source)/talk/app/webrtc/dtlsidentityservice.h',
             '<(libjingle_source)/talk/app/webrtc/dtlsidentitystore.cc',
             '<(libjingle_source)/talk/app/webrtc/dtlsidentitystore.h',
@@ skipping 236 matching lines @@
           'conditions': [
             ['OS=="android"', {
               'standalone_static_library': 1,
             }],
           ],
         },  # target libpeerconnection
       ],
     }],
   ],
 }