Revert of Delete empty API files and cleaned up includes.

talk/app/webrtc/objc/RTCPeerConnectionFactory.mm

 /*
  * libjingle
  * Copyright 2013 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 32 matching lines @@
 #import "RTCPeerConnection+Internal.h"
 #import "RTCPeerConnectionDelegate.h"
 #import "RTCPeerConnectionInterface+Internal.h"
 #import "RTCVideoCapturer+Internal.h"
 #import "RTCVideoSource+Internal.h"
 #import "RTCVideoTrack+Internal.h"
 
 #include "webrtc/api/audiotrack.h"
 #include "webrtc/api/mediastreaminterface.h"
 #include "webrtc/api/peerconnectioninterface.h"
+#include "webrtc/api/videosourceinterface.h"
 #include "webrtc/api/videotrack.h"
 #include "webrtc/base/logging.h"
 #include "webrtc/base/ssladapter.h"
 
 @implementation RTCPeerConnectionFactory {
   std::unique_ptr<rtc::Thread> _signalingThread;
   std::unique_ptr<rtc::Thread> _workerThread;
 }
 
 @synthesize nativeFactory = _nativeFactory;
@@ skipping 75 matching lines @@
   return [[RTCVideoTrack alloc] initWithMediaTrack:track];
 }
 
 - (RTCAudioTrack*)audioTrackWithID:(NSString*)audioId {
   rtc::scoped_refptr<webrtc::AudioTrackInterface> track =
       self.nativeFactory->CreateAudioTrack([audioId UTF8String], NULL);
   return [[RTCAudioTrack alloc] initWithMediaTrack:track];
 }
 
 @end