Remove SendPacer from ViEEncoder

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 40871af1211d7c5d94c73eea4f9fdf7cdd701995..ad3fbadd14f73bfac3e637866516ee3852646123 100644
--- a/webrtc/video/video_send_stream.cc
+++ b/webrtc/video/video_send_stream.cc
@@ -377,9 +377,7 @@ VideoSendStream::VideoSendStream(
           config_.rtp.ssrcs,
           module_process_thread_,
           &stats_proxy_,
-          config.pre_encode_callback,
           &overuse_detector_,
-          congestion_controller_->pacer(),
           &payload_router_,
           config.post_encode_callback ? &encoded_frame_proxy_ : nullptr),
       video_sender_(vie_encoder_.video_sender()),
@@ -558,8 +556,14 @@ void VideoSendStream::EncoderProcess() {
     }
 
     VideoFrame frame;
-    if (input_.GetVideoFrame(&frame))
+    if (input_.GetVideoFrame(&frame)) {
+      // TODO(perkj): |pre_encode_callback| is only used by tests. Tests should
+      // register as a sink to the VideoSource instead.
+      if (config_.pre_encode_callback) {
+        config_.pre_encode_callback->OnFrame(frame);
+      }
       vie_encoder_.EncodeVideoFrame(frame);
+    }
   }
   vie_encoder_.DeRegisterExternalEncoder(config_.encoder_settings.payload_type);
 }