Use a direct include of strings headers in chrome/browser/r*-s*/.

chrome/browser/storage_monitor/volume_mount_watcher_win.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/storage_monitor/volume_mount_watcher_win.h"
 
 #include <windows.h>
 
 #include <dbt.h>
 #include <fileapi.h>
 #include <winioctl.h>
 
 #include "base/bind_helpers.h"
 #include "base/metrics/histogram.h"
 #include "base/stl_util.h"
-#include "base/string_util.h"
-#include "base/stringprintf.h"
 #include "base/strings/string_number_conversions.h"
+#include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/task_runner_util.h"
 #include "base/time.h"
 #include "base/win/scoped_handle.h"
 #include "chrome/browser/storage_monitor/media_storage_util.h"
 #include "chrome/browser/storage_monitor/storage_info.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/user_metrics.h"
 
 using content::BrowserThread;
@@ skipping 497 matching lines @@
     callback.Run(StorageMonitor::EJECT_FAILURE);
     return;
   }
 
   task_runner_->PostTask(
       FROM_HERE,
       base::Bind(&EjectDeviceInThreadPool, device, callback, task_runner_, 0));
 }
 
 }  // namespace chrome