Revert of Replace interface VideoCapturerInput with VideoSinkInterface.

webrtc/video/video_send_stream.cc

Index: webrtc/video/video_send_stream.cc
diff --git a/webrtc/video/video_send_stream.cc b/webrtc/video/video_send_stream.cc
index e9654dd29367449f6247e4350d6b54b9ef4de173..2f8241e28ed1c6b0e273d982a83ef09a0ce35f1f 100644
--- a/webrtc/video/video_send_stream.cc
+++ b/webrtc/video/video_send_stream.cc
@@ -545,10 +545,12 @@
   worker_queue_->PostTask([send_stream] { send_stream->Stop(); });
 }
 
-void VideoSendStream::SetSource(
-    rtc::VideoSourceInterface<webrtc::VideoFrame>* source) {
-  RTC_DCHECK_RUN_ON(&thread_checker_);
-  vie_encoder_->SetSource(source);
+VideoCaptureInput* VideoSendStream::Input() {
+  // Input() will be called on the thread that deliverers video frames from
+  // libjingle.
+  // TODO(perkj): Refactor ViEEncoder to register directly as a VideoSink to the
+  // VideoSource.
+  return vie_encoder_.get();
 }
 
 void VideoSendStream::ReconfigureVideoEncoder(VideoEncoderConfig config) {