Add RtcEventLogFactory factory with explicit TaskQueueFactory

remove RtcEventLog factory function that relies on GlobalTaskQueueFactory,
move that default behaviour up to RtcEventLogFactory level.

Bug: webrtc:10284
Change-Id: I512d8a13e6a2f320000dd08e6355c0a7e9de8561
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/132542
Reviewed-by: Björn Terelius <terelius@webrtc.org>
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Reviewed-by: Niels Moller <nisse@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27573}

logging/rtc_event_log/rtc_event_log.h

@@ -35,8 +35,6 @@ class RtcEventLog {
   virtual ~RtcEventLog() {}
 
   // Factory method to create an RtcEventLog object.
-  static std::unique_ptr<RtcEventLog> Create(EncodingType encoding_type);
-
   static std::unique_ptr<RtcEventLog> Create(
       EncodingType encoding_type,
       TaskQueueFactory* task_queue_factory);