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/receiver.h

@@ -30,17 +30,16 @@ class VCMReceiver {
  public:
   // Constructor for current interface, will be removed when the
   // new jitter buffer is in place.
-  VCMReceiver(VCMTiming* timing, Clock* clock, EventFactory* event_factory);
+  VCMReceiver(VCMTiming* timing, Clock* clock);
 
   // Create method for the new jitter buffer.
   VCMReceiver(VCMTiming* timing,
               Clock* clock,
-              EventFactory* event_factory,
               NackSender* nack_sender,
               KeyFrameRequestSender* keyframe_request_sender);
 
-  // Using this constructor, you can specify a different event factory for the
-  // jitter buffer. Useful for unit tests when you want to simulate incoming
+  // Using this constructor, you can specify a different event implemetation for
+  // the jitter buffer. Useful for unit tests when you want to simulate incoming
   // packets, in which case the jitter buffer's wait event is different from
   // that of VCMReceiver itself.
   //