Deprecate EventFactory and delete all usage.

Will be deleted as soon as downstream calls of
VideoCodingModule::Create are updated.

Tbr: sprang@webrtc.org  # Trivial change in video/
Bug: webrtc:3380
Change-Id: Iaeb6da2fb68991225fe9086ddddd4a553e1620b4
Reviewed-on: https://webrtc-review.googlesource.com/c/107890
Reviewed-by: Niels Moller <nisse@webrtc.org>
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25554}

modules/video_coding/video_coding_impl.h

@@ -127,7 +127,6 @@ class VideoSender {
 class VideoReceiver : public Module {
  public:
   VideoReceiver(Clock* clock,
-                EventFactory* event_factory,
                 VCMTiming* timing,
                 NackSender* nack_sender = nullptr,
                 KeyFrameRequestSender* keyframe_request_sender = nullptr);