Use VoiceChannel/VideoChannel directly from RtpSender/RtpReceiver.

webrtc/api/api.gyp

 # Copyright (c) 2015 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.
 
 {
   'includes': [ '../build/common.gypi', ],
@@ skipping 138 matching lines @@
         'localaudiosource.h',
         'mediaconstraintsinterface.cc',
         'mediaconstraintsinterface.h',
         'mediacontroller.cc',
         'mediacontroller.h',
         'mediastream.cc',
         'mediastream.h',
         'mediastreaminterface.h',
         'mediastreamobserver.cc',
         'mediastreamobserver.h',
-        'mediastreamprovider.h',
         'mediastreamproxy.h',
         'mediastreamtrack.h',
         'mediastreamtrackproxy.h',
         'notifier.h',
         'peerconnection.cc',
         'peerconnection.h',
         'peerconnectionfactory.cc',
         'peerconnectionfactory.h',
         'peerconnectionfactoryproxy.h',
         'peerconnectioninterface.h',
@@ skipping 75 matching lines @@
             'quicdatatransport.h',
           ],
           'export_dependent_settings': [
             '<(DEPTH)/third_party/libquic/libquic.gyp:libquic',
           ],
         }],
       ],
     },  # target libjingle_peerconnection
   ],  # targets
 }