[filemanager] Implementing undo delete functionality.

chrome/browser/chromeos/extensions/file_browser_private_api.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/extensions/file_browser_private_api.h"
 
 #include <sys/statvfs.h>
 #include <utility>
 
 #include "base/base64.h"
@@ skipping 1682 matching lines @@
   SET_STRING(IDS_FILE_BROWSER, COPY_TARGET_EXISTS_ERROR);
   SET_STRING(IDS_FILE_BROWSER, COPY_FILESYSTEM_ERROR);
   SET_STRING(IDS_FILE_BROWSER, COPY_UNEXPECTED_ERROR);
   SET_STRING(IDS_FILE_BROWSER, MOVE_FILE_NAME);
   SET_STRING(IDS_FILE_BROWSER, MOVE_ITEMS_REMAINING);
   SET_STRING(IDS_FILE_BROWSER, MOVE_CANCELLED);
   SET_STRING(IDS_FILE_BROWSER, MOVE_TARGET_EXISTS_ERROR);
   SET_STRING(IDS_FILE_BROWSER, MOVE_FILESYSTEM_ERROR);
   SET_STRING(IDS_FILE_BROWSER, MOVE_UNEXPECTED_ERROR);
 
+  SET_STRING(IDS_FILE_BROWSER, DELETED_MESSAGE_PLURAL);
+  SET_STRING(IDS_FILE_BROWSER, DELETED_MESSAGE);
+
   SET_STRING(IDS_FILE_BROWSER, CANCEL_LABEL);
   SET_STRING(IDS_FILE_BROWSER, OPEN_LABEL);
   SET_STRING(IDS_FILE_BROWSER, SAVE_LABEL);
   SET_STRING(IDS_FILE_BROWSER, OK_LABEL);
 
   SET_STRING(IDS_FILE_BROWSER, DEFAULT_NEW_FOLDER_NAME);
   SET_STRING(IDS_FILE_BROWSER, MORE_FILES);
 
   SET_STRING(IDS_FILE_BROWSER, CONFIRM_DELETE_ONE);
   SET_STRING(IDS_FILE_BROWSER, CONFIRM_DELETE_SOME);
@@ skipping 874 matching lines @@
   gdata::DriveSystemService* system_service =
       gdata::DriveSystemServiceFactory::GetForProfile(profile_);
   if (!system_service || !system_service->file_system())
     return false;
 
   FilePath directory_path = GetVirtualPathFromURL(GURL(file_url_as_string));
   system_service->file_system()->RequestDirectoryRefresh(directory_path);
 
   return true;
 }