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

chrome/browser/chromeos/login/screen_locker_delegate.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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_SCREEN_LOCKER_DELEGATE_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SCREEN_LOCKER_DELEGATE_H_
 
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "chrome/browser/chromeos/login/help_app_launcher.h"
 #include "ui/gfx/native_widget_types.h"
 
 class GURL;
 
 namespace content {
 class WebUI;
 }
 
 namespace chromeos {
@@ skipping 47 matching lines @@
  protected:
   // ScreenLocker that owns this delegate.
   ScreenLocker* screen_locker_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenLockerDelegate);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREEN_LOCKER_DELEGATE_H_