Use a direct include of strings headers in chromeos/.

chromeos/disks/disk_mount_manager.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 "chromeos/disks/disk_mount_manager.h"
 
 #include <map>
 #include <set>
 
 #include "base/bind.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "base/stl_util.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 
 namespace chromeos {
 namespace disks {
 
 namespace {
 
 const char kDeviceNotFound[] = "Device could not be found";
 
 DiskMountManager* g_disk_mount_manager = NULL;
@@ skipping 733 matching lines @@
   VLOG(1) << "DiskMountManager Shutdown completed";
 }
 
 // static
 DiskMountManager* DiskMountManager::GetInstance() {
   return g_disk_mount_manager;
 }
 
 }  // namespace disks
 }  // namespace chromeos