Revert of Delete base/prefs and update callers to use components.

components/drive/job_scheduler.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 "components/drive/job_scheduler.h"
 
 #include <stddef.h>
 #include <algorithm>
 #include <utility>
 
 #include "base/files/file_util.h"
 #include "base/metrics/histogram.h"
+#include "base/prefs/pref_service.h"
 #include "base/rand_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "base/thread_task_runner_handle.h"
 #include "components/drive/drive_pref_names.h"
 #include "components/drive/event_logger.h"
-#include "components/prefs/pref_service.h"
 #include "google_apis/drive/drive_api_parser.h"
 
 namespace drive {
 
 namespace {
 
 // All jobs are retried at maximum of kMaxRetryCount when they fail due to
 // throttling or server error.  The delay before retrying a job is shared among
 // jobs. It doubles in length on each failure, upto 2^kMaxThrottleCount seconds.
 //
@@ skipping 1156 matching lines @@
     case FILE_QUEUE:
       return "FILE_QUEUE";
     case NUM_QUEUES:
       break;  // This value is just a sentinel. Should never be used.
   }
   NOTREACHED();
   return "";
 }
 
 }  // namespace drive