Revert "Add TaskQueueStdlib experiment."

This reverts commit 83db78e854ff35d57124f04aff9464c0862cd833.

Reason for revert: Some tests in Chromium's blink no longer compile because of the change in the signature of the CreateDefaultTaskQueueFactory() function.

Original change's description:
> Add TaskQueueStdlib experiment.
>
> Bug: webrtc:14389
> Change-Id: I23c6e0ae675748ec35a99c334104dd2654995a33
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/265802
> Commit-Queue: Ali Tofigh <alito@webrtc.org>
> Reviewed-by: Harald Alvestrand <hta@webrtc.org>
> Reviewed-by: Tomas Gunnarsson <tommi@webrtc.org>
> Reviewed-by: Jonas Oreland <jonaso@webrtc.org>
> Cr-Commit-Position: refs/heads/main@{#37888}

Bug: webrtc:14389
Change-Id: If3e63d6b4ab9e838dc5020b88076a73fd29916e4
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/272920
Bot-Commit: rubber-stamper@appspot.gserviceaccount.com <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Harald Alvestrand <hta@webrtc.org>
Auto-Submit: Ali Tofigh <alito@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#37902}
diff --git a/api/task_queue/task_queue_test.cc b/api/task_queue/task_queue_test.cc
index 0f6b1d0..69532d6 100644
--- a/api/task_queue/task_queue_test.cc
+++ b/api/task_queue/task_queue_test.cc
@@ -13,7 +13,6 @@
 
 #include "absl/cleanup/cleanup.h"
 #include "absl/strings/string_view.h"
-#include "api/task_queue/default_task_queue_factory.h"
 #include "api/units/time_delta.h"
 #include "rtc_base/event.h"
 #include "rtc_base/ref_counter.h"
@@ -30,13 +29,13 @@
 }
 
 TEST_P(TaskQueueTest, Construct) {
-  std::unique_ptr<webrtc::TaskQueueFactory> factory = GetParam()(nullptr);
+  std::unique_ptr<webrtc::TaskQueueFactory> factory = GetParam()();
   auto queue = CreateTaskQueue(factory, "Construct");
   EXPECT_FALSE(queue->IsCurrent());
 }
 
 TEST_P(TaskQueueTest, PostAndCheckCurrent) {
-  std::unique_ptr<webrtc::TaskQueueFactory> factory = GetParam()(nullptr);
+  std::unique_ptr<webrtc::TaskQueueFactory> factory = GetParam()();
   rtc::Event event;
   auto queue = CreateTaskQueue(factory, "PostAndCheckCurrent");
 
@@ -54,7 +53,7 @@
 }
 
 TEST_P(TaskQueueTest, PostCustomTask) {
-  std::unique_ptr<webrtc::TaskQueueFactory> factory = GetParam()(nullptr);
+  std::unique_ptr<webrtc::TaskQueueFactory> factory = GetParam()();
   rtc::Event ran;
   auto queue = CreateTaskQueue(factory, "PostCustomImplementation");
 
@@ -73,7 +72,7 @@
 }
 
 TEST_P(TaskQueueTest, PostDelayedZero) {
-  std::unique_ptr<webrtc::TaskQueueFactory> factory = GetParam()(nullptr);
+  std::unique_ptr<webrtc::TaskQueueFactory> factory = GetParam()();
   rtc::Event event;
   auto queue = CreateTaskQueue(factory, "PostDelayedZero");
 
@@ -82,7 +81,7 @@
 }
 
 TEST_P(TaskQueueTest, PostFromQueue) {
-  std::unique_ptr<webrtc::TaskQueueFactory> factory = GetParam()(nullptr);
+  std::unique_ptr<webrtc::TaskQueueFactory> factory = GetParam()();
   rtc::Event event;
   auto queue = CreateTaskQueue(factory, "PostFromQueue");
 
@@ -92,7 +91,7 @@
 }
 
 TEST_P(TaskQueueTest, PostDelayed) {
-  std::unique_ptr<webrtc::TaskQueueFactory> factory = GetParam()(nullptr);
+  std::unique_ptr<webrtc::TaskQueueFactory> factory = GetParam()();
   rtc::Event event;
   auto queue =
       CreateTaskQueue(factory, "PostDelayed", TaskQueueFactory::Priority::HIGH);
@@ -114,7 +113,7 @@
 }
 
 TEST_P(TaskQueueTest, PostMultipleDelayed) {
-  std::unique_ptr<webrtc::TaskQueueFactory> factory = GetParam()(nullptr);
+  std::unique_ptr<webrtc::TaskQueueFactory> factory = GetParam()();
   auto queue = CreateTaskQueue(factory, "PostMultipleDelayed");
 
   std::vector<rtc::Event> events(100);
@@ -133,7 +132,7 @@
 }
 
 TEST_P(TaskQueueTest, PostDelayedAfterDestruct) {
-  std::unique_ptr<webrtc::TaskQueueFactory> factory = GetParam()(nullptr);
+  std::unique_ptr<webrtc::TaskQueueFactory> factory = GetParam()();
   rtc::Event run;
   rtc::Event deleted;
   auto queue = CreateTaskQueue(factory, "PostDelayedAfterDestruct");
@@ -148,7 +147,7 @@
 }
 
 TEST_P(TaskQueueTest, PostAndReuse) {
-  std::unique_ptr<webrtc::TaskQueueFactory> factory = GetParam()(nullptr);
+  std::unique_ptr<webrtc::TaskQueueFactory> factory = GetParam()();
   rtc::Event event;
   auto post_queue = CreateTaskQueue(factory, "PostQueue");
   auto reply_queue = CreateTaskQueue(factory, "ReplyQueue");
@@ -204,7 +203,7 @@
     rtc::Event event_;
   };
 
-  std::unique_ptr<webrtc::TaskQueueFactory> factory = GetParam()(nullptr);
+  std::unique_ptr<webrtc::TaskQueueFactory> factory = GetParam()();
   static constexpr int kTaskCount = 0xffff;
   rtc::Event posting_done;
   BlockingCounter all_destroyed(kTaskCount);
@@ -248,7 +247,7 @@
 // unit test, run it under TSan or some other tool that is able to
 // directly detect data races.
 TEST_P(TaskQueueTest, PostTwoWithSharedUnprotectedState) {
-  std::unique_ptr<webrtc::TaskQueueFactory> factory = GetParam()(nullptr);
+  std::unique_ptr<webrtc::TaskQueueFactory> factory = GetParam()();
   struct SharedState {
     // First task will set this value to 1 and second will assert it.
     int state = 0;