Revert: Change VideoTrack implementation to invoke VideoTrackSourceInterface::AddOrUpdateSink on wt

webrtc/pc/peerconnectioninterface_unittest.cc

Index: webrtc/pc/peerconnectioninterface_unittest.cc
diff --git a/webrtc/pc/peerconnectioninterface_unittest.cc b/webrtc/pc/peerconnectioninterface_unittest.cc
index ae4bca9e40924e235b59689a508bb9e32a5a4b79..f8d9ef60208e0b81786012dc6e734f8547d7d5ab 100644
--- a/webrtc/pc/peerconnectioninterface_unittest.cc
+++ b/webrtc/pc/peerconnectioninterface_unittest.cc
@@ -458,8 +458,7 @@
       // Add a local video track.
       rtc::scoped_refptr<webrtc::VideoTrackInterface> video_track(
           webrtc::VideoTrack::Create(kVideoTracks[i * tracks_per_stream + j],
-                                     webrtc::FakeVideoTrackSource::Create(),
-                                     rtc::Thread::Current()));
+                                     webrtc::FakeVideoTrackSource::Create()));
       stream->AddTrack(video_track);
     }
 
@@ -1094,8 +1093,7 @@
                      MediaStreamInterface* stream) {
     rtc::scoped_refptr<webrtc::VideoTrackInterface> video_track(
         webrtc::VideoTrack::Create(track_id,
-                                   webrtc::FakeVideoTrackSource::Create(),
-                                   rtc::Thread::Current()));
+                                   webrtc::FakeVideoTrackSource::Create()));
     ASSERT_TRUE(stream->AddTrack(video_track));
   }