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

components/scheduler/child/scheduler_task_runner_delegate_for_test.cc

-// Copyright 2015 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/scheduler_task_runner_delegate_for_test.h"
-
-#include "base/bind.h"
-#include "base/bind_helpers.h"
-#include "components/scheduler/child/nestable_task_runner_for_test.h"
-
-namespace scheduler {
-
-// static
-scoped_refptr<SchedulerTaskRunnerDelegateForTest>
-SchedulerTaskRunnerDelegateForTest::Create(
-    scoped_refptr<base::SingleThreadTaskRunner> task_runner) {
-  return make_scoped_refptr(
-      new SchedulerTaskRunnerDelegateForTest(task_runner));
-}
-
-SchedulerTaskRunnerDelegateForTest::SchedulerTaskRunnerDelegateForTest(
-    scoped_refptr<base::SingleThreadTaskRunner> task_runner)
-    : task_runner_(NestableTaskRunnerForTest::Create(task_runner)) {
-}
-
-SchedulerTaskRunnerDelegateForTest::~SchedulerTaskRunnerDelegateForTest() {
-}
-
-void SchedulerTaskRunnerDelegateForTest::SetDefaultTaskRunner(
-    scoped_refptr<base::SingleThreadTaskRunner> task_runner) {
-  default_task_runner_ = task_runner.Pass();
-}
-
-void SchedulerTaskRunnerDelegateForTest::RestoreDefaultTaskRunner() {
-  default_task_runner_ = nullptr;
-}
-
-bool SchedulerTaskRunnerDelegateForTest::PostDelayedTask(
-    const tracked_objects::Location& from_here,
-    const base::Closure& task,
-    base::TimeDelta delay) {
-  return task_runner_->PostDelayedTask(from_here, task, delay);
-}
-
-bool SchedulerTaskRunnerDelegateForTest::PostNonNestableDelayedTask(
-    const tracked_objects::Location& from_here,
-    const base::Closure& task,
-    base::TimeDelta delay) {
-  return task_runner_->PostNonNestableDelayedTask(from_here, task, delay);
-}
-
-bool SchedulerTaskRunnerDelegateForTest::RunsTasksOnCurrentThread() const {
-  return task_runner_->RunsTasksOnCurrentThread();
-}
-
-bool SchedulerTaskRunnerDelegateForTest::IsNested() const {
-  return task_runner_->IsNested();
-}
-
-void SchedulerTaskRunnerDelegateForTest::AddTaskObserver(
-    base::MessageLoop::TaskObserver* task_observer) {
-  task_runner_->AddTaskObserver(task_observer);
-}
-
-void SchedulerTaskRunnerDelegateForTest::RemoveTaskObserver(
-    base::MessageLoop::TaskObserver* task_observer) {
-  task_runner_->RemoveTaskObserver(task_observer);
-}
-
-}  // namespace scheduler