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

components/scheduler/child/worker_scheduler_impl_unittest.cc

Index: components/scheduler/child/worker_scheduler_impl_unittest.cc
diff --git a/components/scheduler/child/worker_scheduler_impl_unittest.cc b/components/scheduler/child/worker_scheduler_impl_unittest.cc
index 9b17b157669d8e698f8229658f770e12c2b9e352..451d86197ce7e8fce8f6f4ff1c5d3bcae921f40f 100644
--- a/components/scheduler/child/worker_scheduler_impl_unittest.cc
+++ b/components/scheduler/child/worker_scheduler_impl_unittest.cc
@@ -8,7 +8,8 @@
 #include "base/strings/stringprintf.h"
 #include "base/test/simple_test_tick_clock.h"
 #include "cc/test/ordered_simple_task_runner.h"
-#include "components/scheduler/child/scheduler_task_runner_delegate_for_test.h"
+#include "components/scheduler/child/nestable_task_runner_for_test.h"
+#include "components/scheduler/child/scheduler_message_loop_delegate.h"
 #include "components/scheduler/child/test_time_source.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -53,7 +54,7 @@
 class WorkerSchedulerImplForTest : public WorkerSchedulerImpl {
  public:
   WorkerSchedulerImplForTest(
-      scoped_refptr<SchedulerTaskRunnerDelegate> main_task_runner,
+      scoped_refptr<NestableSingleThreadTaskRunner> main_task_runner,
       base::SimpleTestTickClock* clock_)
       : WorkerSchedulerImpl(main_task_runner),
         clock_(clock_),
@@ -92,10 +93,10 @@
   WorkerSchedulerImplTest()
       : clock_(new base::SimpleTestTickClock()),
         mock_task_runner_(new cc::OrderedSimpleTaskRunner(clock_.get(), true)),
-        main_task_runner_(
-            SchedulerTaskRunnerDelegateForTest::Create(mock_task_runner_)),
-        scheduler_(
-            new WorkerSchedulerImplForTest(main_task_runner_, clock_.get())),
+        nestable_task_runner_(
+            NestableTaskRunnerForTest::Create(mock_task_runner_)),
+        scheduler_(new WorkerSchedulerImplForTest(nestable_task_runner_,
+                                                  clock_.get())),
         timeline_(nullptr) {
     clock_->Advance(base::TimeDelta::FromMicroseconds(5000));
     scheduler_->GetSchedulerHelperForTesting()->SetTimeSourceForTesting(
@@ -175,7 +176,7 @@
   // Only one of mock_task_runner_ or message_loop_ will be set.
   scoped_refptr<cc::OrderedSimpleTaskRunner> mock_task_runner_;
 
-  scoped_refptr<SchedulerTaskRunnerDelegate> main_task_runner_;
+  scoped_refptr<NestableSingleThreadTaskRunner> nestable_task_runner_;
   scoped_ptr<WorkerSchedulerImplForTest> scheduler_;
   scoped_refptr<base::SingleThreadTaskRunner> default_task_runner_;
   scoped_refptr<SingleThreadIdleTaskRunner> idle_task_runner_;