Move sequenced_task_runner to base/task

base/sequenced_task_runner.cc

-// Copyright (c) 2012 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 "base/sequenced_task_runner.h"
-
-#include "base/bind.h"
-
-namespace base {
-
-bool SequencedTaskRunner::PostNonNestableTask(
-    const tracked_objects::Location& from_here,
-    const Closure& task) {
-  return PostNonNestableDelayedTask(from_here, task, base::TimeDelta());
-}
-
-bool SequencedTaskRunner::DeleteSoonInternal(
-    const tracked_objects::Location& from_here,
-    void(*deleter)(const void*),
-    const void* object) {
-  return PostNonNestableTask(from_here, Bind(deleter, object));
-}
-
-bool SequencedTaskRunner::ReleaseSoonInternal(
-    const tracked_objects::Location& from_here,
-    void(*releaser)(const void*),
-    const void* object) {
-  return PostNonNestableTask(from_here, Bind(releaser, object));
-}
-
-}  // namespace base