Use new RTCCameraVideoCapturer in AppRTCMobile.

webrtc/examples/objc/AppRTCMobile/mac/APPRTCViewController.m

 /*
  *  Copyright 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.
  */
 
@@ skipping 336 matching lines @@
       _client = nil;
       break;
   }
 }
 
 - (void)appClient:(ARDAppClient *)client
     didChangeConnectionState:(RTCIceConnectionState)state {
 }
 
 - (void)appClient:(ARDAppClient *)client
+    didCreateLocalCapturer:(RTCCameraVideoCapturer *)localCapturer {
+}
+
+- (void)appClient:(ARDAppClient *)client
     didReceiveLocalVideoTrack:(RTCVideoTrack *)localVideoTrack {
   _localVideoTrack = localVideoTrack;
   [_localVideoTrack addRenderer:self.mainView.localVideoView];
 }
 
 - (void)appClient:(ARDAppClient *)client
     didReceiveRemoteVideoTrack:(RTCVideoTrack *)remoteVideoTrack {
   _remoteVideoTrack = remoteVideoTrack;
   [_remoteVideoTrack addRenderer:self.mainView.remoteVideoView];
 }
@@ skipping 50 matching lines @@
   [self.mainView.remoteVideoView renderFrame:nil];
   [self.mainView.localVideoView renderFrame:nil];
 }
 
 - (void)disconnect {
   [self resetUI];
   [_client disconnect];
 }
 
 @end