Use a direct include of strings headers in chrome/browser/chromeos/.

chrome/browser/chromeos/login/help_app_launcher.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/login/help_app_launcher.h"
 
 #include <string>
 
-#include "base/stringprintf.h"
+#include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_system.h"
 #include "content/public/browser/browser_thread.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 
 using content::BrowserThread;
 
@@ skipping 44 matching lines @@
       NULL,
       parent_window_,
       l10n_util::GetStringUTF16(IDS_LOGIN_OOBE_HELP_DIALOG_TITLE),
       topic_url,
       LoginWebDialog::STYLE_BUBBLE);
   dialog->Show();
   // The dialog object will be deleted on dialog close.
 }
 
 }  // namespace chromeos