chrome: Cleanup class/struct forward declarations

chrome/browser/chromeos/login/lock/screen_locker.h

 // Copyright 2014 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_LOCK_SCREEN_LOCKER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_LOCK_SCREEN_LOCKER_H_
 
 #include <memory>
 #include <string>
 
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/sequenced_task_runner_helpers.h"
 #include "base/time/time.h"
 #include "chrome/browser/chromeos/login/help_app_launcher.h"
 #include "chrome/browser/chromeos/login/ui/login_display.h"
 #include "chromeos/login/auth/auth_status_consumer.h"
 #include "chromeos/login/auth/user_context.h"
 #include "components/user_manager/user.h"
 #include "ui/base/accelerators/accelerator.h"
 #include "ui/base/ime/chromeos/input_method_manager.h"
 
-namespace content {
-class WebUI;
-}
-
-namespace gfx {
-class Image;
-}
-
 namespace chromeos {
 
 class Authenticator;
 class ExtendedAuthenticator;
 class AuthFailure;
 class ScreenlockIconProvider;
 class WebUIScreenLocker;
 
 namespace test {
 class ScreenLockerTester;
@@ skipping 156 matching lines @@
   scoped_refptr<input_method::InputMethodManager::State> saved_ime_state_;
 
   base::WeakPtrFactory<ScreenLocker> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenLocker);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_LOCK_SCREEN_LOCKER_H_