Delete RtcEventLogFactory factory as now unused

Bug: webrtc:10206, webrtc:10284
Change-Id: I34fa780f566b52e375ec625bf0d5d02c505d9912
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/143782
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#28400}

sdk/android/BUILD.gn

@@ -1476,10 +1476,10 @@ if (is_android) {
       ":opensles_audio_device_module",
       ":video_jni",
       "../../api:scoped_refptr",
+      "../../api/rtc_event_log:rtc_event_log_factory",
       "../../api/task_queue:default_task_queue_factory",
       "../../api/video:video_frame",
       "../../api/video:video_rtp_headers",
-      "../../logging:rtc_event_log_impl_base",
       "../../media:rtc_audio_video",
       "../../media:rtc_internal_video_codecs",
       "../../media:rtc_media_base",

sdk/android/native_unittests/peerconnection/peer_connection_factory_unittest.cc

@@ -10,8 +10,8 @@
 #include "sdk/android/native_api/peerconnection/peer_connection_factory.h"
 
 #include "absl/memory/memory.h"
+#include "api/rtc_event_log/rtc_event_log_factory.h"
 #include "api/task_queue/default_task_queue_factory.h"
-#include "logging/rtc_event_log/rtc_event_log_factory.h"
 #include "media/base/media_engine.h"
 #include "media/engine/internal_decoder_factory.h"
 #include "media/engine/internal_encoder_factory.h"