Use vcm::VideoReceiver on the receive side.

webrtc/modules/video_coding/receiver.cc

Index: webrtc/modules/video_coding/receiver.cc
diff --git a/webrtc/modules/video_coding/receiver.cc b/webrtc/modules/video_coding/receiver.cc
index a02fd01de6a7e1c9a301d14f242d6af58779711d..abe8ede76c36e7ac4e8088530972c3939f783114 100644
--- a/webrtc/modules/video_coding/receiver.cc
+++ b/webrtc/modules/video_coding/receiver.cc
@@ -42,12 +42,17 @@ VCMReceiver::VCMReceiver(VCMTiming* timing,
                          EventFactory* event_factory,
                          NackSender* nack_sender,
                          KeyFrameRequestSender* keyframe_request_sender)
-    : VCMReceiver(timing,
-                  clock,
-                  std::unique_ptr<EventWrapper>(event_factory->CreateEvent()),
-                  std::unique_ptr<EventWrapper>(event_factory->CreateEvent()),
-                  nack_sender,
-                  keyframe_request_sender) {}
+    : VCMReceiver(
+          timing,
+          clock,
+          std::unique_ptr<EventWrapper>(event_factory
+                                            ? event_factory->CreateEvent()
+                                            : EventWrapper::Create()),
+          std::unique_ptr<EventWrapper>(event_factory
+                                            ? event_factory->CreateEvent()
+                                            : EventWrapper::Create()),
+          nack_sender,
+          keyframe_request_sender) {}
 
 VCMReceiver::VCMReceiver(VCMTiming* timing,
                          Clock* clock,