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

components/scheduler/child/scheduler_message_loop_delegate.h

Index: components/scheduler/child/scheduler_message_loop_delegate.h
diff --git a/components/scheduler/child/scheduler_message_loop_delegate.h b/components/scheduler/child/scheduler_message_loop_delegate.h
new file mode 100644
index 0000000000000000000000000000000000000000..164ab31768a413eb607c0d2fd14c1cda36727641
--- /dev/null
+++ b/components/scheduler/child/scheduler_message_loop_delegate.h
@@ -0,0 +1,48 @@
+// 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.
+
+#ifndef COMPONENTS_SCHEDULER_CHILD_SCHEDULER_MESSAGE_LOOP_DELEGATE_H_
+#define COMPONENTS_SCHEDULER_CHILD_SCHEDULER_MESSAGE_LOOP_DELEGATE_H_
+
+#include "base/message_loop/message_loop.h"
+#include "components/scheduler/child/nestable_single_thread_task_runner.h"
+#include "components/scheduler/scheduler_export.h"
+
+namespace scheduler {
+
+class SCHEDULER_EXPORT SchedulerMessageLoopDelegate
+    : public NestableSingleThreadTaskRunner {
+ public:
+  // |message_loop| is not owned and must outlive the lifetime of this object.
+  static scoped_refptr<SchedulerMessageLoopDelegate> Create(
+      base::MessageLoop* message_loop);
+
+  // NestableSingleThreadTaskRunner implementation
+  bool PostDelayedTask(const tracked_objects::Location& from_here,
+                       const base::Closure& task,
+                       base::TimeDelta delay) override;
+  bool PostNonNestableDelayedTask(const tracked_objects::Location& from_here,
+                                  const base::Closure& task,
+                                  base::TimeDelta delay) override;
+  bool RunsTasksOnCurrentThread() const override;
+  bool IsNested() const override;
+  void AddTaskObserver(base::MessageLoop::TaskObserver* task_observer) override;
+  void RemoveTaskObserver(
+      base::MessageLoop::TaskObserver* task_observer) override;
+
+ protected:
+  ~SchedulerMessageLoopDelegate() override;
+
+ private:
+  SchedulerMessageLoopDelegate(base::MessageLoop* message_loop);
+
+  // Not owned.
+  base::MessageLoop* message_loop_;
+
+  DISALLOW_COPY_AND_ASSIGN(SchedulerMessageLoopDelegate);
+};
+
+}  // namespace scheduler
+
+#endif  // COMPONENTS_SCHEDULER_CHILD_SCHEDULER_MESSAGE_LOOP_DELEGATE_H_