Delete NullEventFactory

A preparation for deleting EventFactory and EventWrapper, to instead
use rtc::Event directly.

Bug: webrtc:3380
Change-Id: I4c40daca9268e57b06d506d91e09365091c42ad6
Reviewed-on: https://webrtc-review.googlesource.com/c/109880
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25545}
diff --git a/modules/video_coding/receiver_unittest.cc b/modules/video_coding/receiver_unittest.cc
index 1ff8662..320d466 100644
--- a/modules/video_coding/receiver_unittest.cc
+++ b/modules/video_coding/receiver_unittest.cc
@@ -18,7 +18,6 @@
 #include "modules/video_coding/packet.h"
 #include "modules/video_coding/receiver.h"
 #include "modules/video_coding/test/stream_generator.h"
-#include "modules/video_coding/test/test_util.h"
 #include "modules/video_coding/timing.h"
 #include "rtc_base/checks.h"
 #include "system_wrappers/include/clock.h"
@@ -31,7 +30,7 @@
   TestVCMReceiver()
       : clock_(new SimulatedClock(0)),
         timing_(clock_.get()),
-        receiver_(&timing_, clock_.get(), &event_factory_) {
+        receiver_(&timing_, clock_.get(), nullptr) {
     stream_generator_.reset(
         new StreamGenerator(0, clock_->TimeInMilliseconds()));
   }
@@ -81,7 +80,6 @@
 
   std::unique_ptr<SimulatedClock> clock_;
   VCMTiming timing_;
-  NullEventFactory event_factory_;
   VCMReceiver receiver_;
   std::unique_ptr<StreamGenerator> stream_generator_;
 };