Deprecate RtcEventLogFactory constructor taking unused parameter

Bug: webrtc:15656
Change-Id: I22ed4cca4c0ce7ebf9c533ed7434617bf0a0f4a3
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/330120
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#41338}

api/create_peerconnection_factory.cc

diff --git a/api/create_peerconnection_factory.cc b/api/create_peerconnection_factory.cc
index 5d3aace..bd77f74 100644
--- a/api/create_peerconnection_factory.cc
+++ b/api/create_peerconnection_factory.cc
@@ -48,8 +48,7 @@
   dependencies.signaling_thread = signaling_thread;
   dependencies.task_queue_factory =
       CreateDefaultTaskQueueFactory(field_trials.get());
-  dependencies.event_log_factory = std::make_unique<RtcEventLogFactory>(
-      dependencies.task_queue_factory.get());
+  dependencies.event_log_factory = std::make_unique<RtcEventLogFactory>();
   dependencies.trials = std::move(field_trials);
 
   if (network_thread) {

api/rtc_event_log/rtc_event_log_factory.h

diff --git a/api/rtc_event_log/rtc_event_log_factory.h b/api/rtc_event_log/rtc_event_log_factory.h
index 21a670e..1deb061 100644
--- a/api/rtc_event_log/rtc_event_log_factory.h
+++ b/api/rtc_event_log/rtc_event_log_factory.h
@@ -26,10 +26,9 @@
  public:
   RtcEventLogFactory() = default;
 
-  // TODO(bugs.webrtc.org/15656): deprecate and delete constructor taking
-  // task queue factory in favor of using task queue factory provided through
-  // the Environment parameter in Create function.
+  [[deprecated("Use default constructor")]]  //
   explicit RtcEventLogFactory(TaskQueueFactory* task_queue_factory) {}
+
   ~RtcEventLogFactory() override = default;
 
   absl::Nonnull<std::unique_ptr<RtcEventLog>> Create(