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

chrome/browser/chromeos/login/helper.h

 // 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.
 //
 // This file contains helper functions used by Chromium OS login.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_HELPER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_HELPER_H_
 
 #include "base/compiler_specific.h"
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/views/view.h"
 
 class GURL;
 
 namespace gfx {
 class Rect;
 class Size;
 }  // namespace gfx
 
@@ skipping 20 matching lines @@
 
 // Maximum size of user image, in which it should be saved to be properly
 // displayed under all possible DPI values.
 const int kMaxUserImageSize = 512;
 
 }  // namespace login
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_HELPER_H_