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/video_receiver_unittest.cc b/modules/video_coding/video_receiver_unittest.cc
index f50398c..c446108 100644
--- a/modules/video_coding/video_receiver_unittest.cc
+++ b/modules/video_coding/video_receiver_unittest.cc
@@ -14,7 +14,6 @@
 #include "api/test/mock_video_decoder.h"
 #include "modules/video_coding/include/mock/mock_vcm_callbacks.h"
 #include "modules/video_coding/include/video_coding.h"
-#include "modules/video_coding/test/test_util.h"
 #include "modules/video_coding/timing.h"
 #include "modules/video_coding/video_coding_impl.h"
 #include "system_wrappers/include/clock.h"
@@ -37,7 +36,7 @@
 
   virtual void SetUp() {
     timing_.reset(new VCMTiming(&clock_));
-    receiver_.reset(new VideoReceiver(&clock_, &event_factory_, timing_.get()));
+    receiver_.reset(new VideoReceiver(&clock_, nullptr, timing_.get()));
     receiver_->RegisterExternalDecoder(&decoder_, kUnusedPayloadType);
     const size_t kMaxNackListSize = 250;
     const int kMaxPacketAgeToNack = 450;
@@ -81,7 +80,6 @@
   }
 
   SimulatedClock clock_;
-  NullEventFactory event_factory_;
   VideoCodec settings_;
   NiceMock<MockVideoDecoder> decoder_;
   NiceMock<MockPacketRequestCallback> packet_request_callback_;