Revert of Redirect the MessageLoop's task runner to the renderer scheduler

components/scheduler/child/worker_scheduler_impl.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/scheduler/child/worker_scheduler_impl.h"
 
 #include "base/bind.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_argument.h"
-#include "components/scheduler/child/scheduler_task_runner_delegate.h"
+#include "components/scheduler/child/nestable_single_thread_task_runner.h"
 
 namespace scheduler {
 
 WorkerSchedulerImpl::WorkerSchedulerImpl(
-    scoped_refptr<SchedulerTaskRunnerDelegate> main_task_runner)
+    scoped_refptr<NestableSingleThreadTaskRunner> main_task_runner)
     : helper_(main_task_runner,
               "worker.scheduler",
               TRACE_DISABLED_BY_DEFAULT("worker.scheduler"),
               TRACE_DISABLED_BY_DEFAULT("worker.scheduler.debug"),
               TASK_QUEUE_COUNT),
       idle_helper_(&helper_,
                    this,
                    IDLE_TASK_QUEUE,
                    "worker.scheduler",
                    TRACE_DISABLED_BY_DEFAULT("worker.scheduler"),
@@ skipping 60 matching lines @@
 bool WorkerSchedulerImpl::CanEnterLongIdlePeriod(base::TimeTicks,
                                                  base::TimeDelta*) {
   return true;
 }
 
 base::TimeTicks WorkerSchedulerImpl::CurrentIdleTaskDeadlineForTesting() const {
   return idle_helper_.CurrentIdleTaskDeadline();
 }
 
 }  // namespace scheduler