Use a direct include of utf_string_conversions.h in chrome/browser/, part 3.

chrome/browser/sync_file_system/drive_file_sync_service.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/sync_file_system/drive_file_sync_service.h"
 
 #include <algorithm>
 #include <string>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/location.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop/message_loop_proxy.h"
-#include "base/utf_string_conversions.h"
+#include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/google_apis/drive_api_util.h"
 #include "chrome/browser/google_apis/drive_notification_manager.h"
 #include "chrome/browser/google_apis/drive_notification_manager_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sync_file_system/conflict_resolution_policy.h"
 #include "chrome/browser/sync_file_system/drive/api_util.h"
 #include "chrome/browser/sync_file_system/drive/local_change_processor_delegate.h"
@@ skipping 1737 matching lines @@
     metadata_store_->SetOriginRootDirectory(origin, resource_id);
   }
   callback.Run(status, resource_id);
 }
 
 std::string DriveFileSyncService::sync_root_resource_id() {
   return metadata_store_->sync_root_directory();
 }
 
 }  // namespace sync_file_system