Revert of Worker: Introduce per-global-scope task scheduler

third_party/WebKit/Source/platform/scheduler/child/worker_scheduler.cc

Index: third_party/WebKit/Source/platform/scheduler/child/worker_scheduler.cc
diff --git a/third_party/WebKit/Source/platform/scheduler/child/worker_scheduler.cc b/third_party/WebKit/Source/platform/scheduler/child/worker_scheduler.cc
index d3ca3a9c7f017b8d65a839a60b96b86c46fe11e1..1bddca0a91d1dcad3f3bed554309e42547a41dff 100644
--- a/third_party/WebKit/Source/platform/scheduler/child/worker_scheduler.cc
+++ b/third_party/WebKit/Source/platform/scheduler/child/worker_scheduler.cc
@@ -14,8 +14,7 @@
 namespace blink {
 namespace scheduler {
 
-WorkerScheduler::WorkerScheduler(std::unique_ptr<SchedulerHelper> helper)
-    : helper_(std::move(helper)) {}
+WorkerScheduler::WorkerScheduler() {}
 
 WorkerScheduler::~WorkerScheduler() {}
 
@@ -25,15 +24,5 @@
   return base::WrapUnique(new WorkerSchedulerImpl(std::move(main_task_runner)));
 }
 
-scoped_refptr<TaskQueue> WorkerScheduler::CreateUnthrottledTaskRunner(
-    TaskQueue::QueueType queue_type) {
-  helper_->CheckOnValidThread();
-  scoped_refptr<TaskQueue> unthrottled_task_queue(
-      helper_->NewTaskQueue(TaskQueue::Spec(queue_type)
-                                .SetShouldMonitorQuiescence(true)
-                                .SetTimeDomain(nullptr)));
-  return unthrottled_task_queue;
-}
-
 }  // namespace scheduler
 }  // namespace blink