Revert 198844 "Move sequenced_task_runner to base/task"

trunk/src/chrome/browser/chromeos/drive/file_cache_metadata.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 "chrome/browser/chromeos/drive/file_cache_metadata.h"
 
 #include "base/callback.h"
 #include "base/file_util.h"
 #include "base/files/file_enumerator.h"
 #include "base/metrics/histogram.h"
-#include "base/task/sequenced_task_runner.h"
+#include "base/sequenced_task_runner.h"
 #include "chrome/browser/chromeos/drive/drive.pb.h"
 #include "chrome/browser/chromeos/drive/file_cache.h"
 #include "chrome/browser/chromeos/drive/file_system_util.h"
 #include "third_party/leveldatabase/src/include/leveldb/db.h"
 
 namespace drive {
 namespace internal {
 
 namespace {
 
@@ skipping 547 matching lines @@
       new FakeCacheMetadata(blocking_task_runner));
 }
 
 void FileCacheMetadata::AssertOnSequencedWorkerPool() {
   DCHECK(!blocking_task_runner_ ||
          blocking_task_runner_->RunsTasksOnCurrentThread());
 }
 
 }  // namespace internal
 }  // namespace drive