Cleanup: Remove unneeded forward declarations from chrome/browser/chromeos.

chrome/browser/chromeos/login/webui_screen_locker.h

 // Copyright (c) 2011 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_WEBUI_SCREEN_LOCKER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_WEBUI_SCREEN_LOCKER_H_
 #pragma once
 
+#include <string>
+
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/chromeos/login/login_display.h"
 #include "chrome/browser/chromeos/login/screen_locker_delegate.h"
 #include "chrome/browser/chromeos/login/webui_login_view.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "views/widget/widget.h"
 
 #if defined(TOOLKIT_USES_GTK)
 #include "views/widget/native_widget_gtk.h"
 #endif
 
 namespace chromeos {
 
 class ScreenLocker;
 class WebUILoginDisplay;
 
-namespace test {
-class ScreenLockerTester;
-}
-
 // This version of ScreenLockerDelegate displays a WebUI lock screen based on
 // the Oobe account picker screen.
 class WebUIScreenLocker : public WebUILoginView,
                           public LoginDisplay::Delegate,
                           public content::NotificationObserver,
                           public ScreenLockerDelegate {
  public:
   explicit WebUIScreenLocker(ScreenLocker* screen_locker);
 
   // ScreenLockerDelegate implementation:
@@ skipping 38 matching lines @@
 
   // Used for user image changed notifications.
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(WebUIScreenLocker);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_WEBUI_SCREEN_LOCKER_H_