Delete workaround Thread implementation that do not set self as TaskQueue

Bug: webrtc:42221679
Change-Id: I954c622956158997840960ba4cde2955780f4894
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/470980
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Reviewed-by: Tomas Gunnarsson <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#47668}

video/BUILD.gn

diff --git a/video/BUILD.gn b/video/BUILD.gn
index f9307fd..e8d61bc 100644
--- a/video/BUILD.gn
+++ b/video/BUILD.gn
@@ -167,7 +167,6 @@
     "../rtc_base:safe_conversions",
     "../rtc_base:sample_counter",
     "../rtc_base:stringutils",
-    "../rtc_base:threading",
     "../rtc_base:timeutils",
     "../rtc_base/experiments:alr_experiment",
     "../rtc_base/experiments:corruption_detection_frame_selector_settings",

video/receive_statistics_proxy.cc

diff --git a/video/receive_statistics_proxy.cc b/video/receive_statistics_proxy.cc
index ba8313a..b8955f3 100644
--- a/video/receive_statistics_proxy.cc
+++ b/video/receive_statistics_proxy.cc
@@ -37,7 +37,6 @@
 #include "rtc_base/checks.h"
 #include "rtc_base/logging.h"
 #include "rtc_base/strings/string_builder.h"
-#include "rtc_base/thread.h"
 #include "rtc_base/time_utils.h"
 #include "system_wrappers/include/clock.h"
 #include "system_wrappers/include/metrics.h"
@@ -70,20 +69,6 @@
   return "WebRTC.Video";
 }
 
-// TODO(https://bugs.webrtc.org/11572): Workaround for an issue with some
-// webrtc::Thread instances and/or implementations that don't register as the
-// current task queue.
-bool IsCurrentTaskQueueOrThread(TaskQueueBase* task_queue) {
-  if (task_queue->IsCurrent())
-    return true;
-
-  Thread* current_thread = ThreadManager::Instance()->CurrentThread();
-  if (!current_thread)
-    return false;
-
-  return static_cast<TaskQueueBase*>(current_thread) == task_queue;
-}
-
 }  // namespace
 
 ReceiveStatisticsProxy::ReceiveStatisticsProxy(uint32_t remote_ssrc,
@@ -575,7 +560,7 @@
   if (ssrc != remote_ssrc_)
     return;
 
-  if (!IsCurrentTaskQueueOrThread(worker_thread_)) {
+  if (!worker_thread_->IsCurrent()) {
     // RtpRtcpInterface::Configuration has a single
     // RtcpPacketTypeCounterObserver and that same configuration may be used for
     // both receiver and sender (see ModuleRtpRtcpImpl::ModuleRtpRtcpImpl). The