[Clean Skeleton] Migrate code to clean/

ios/chrome/app/app_delegate.h

-// Copyright 2016 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.
-
-// ======                        New Architecture                         =====
-// =         This code is only used in the new iOS Chrome architecture.       =
-// ============================================================================
-
-#ifndef IOS_CHROME_APP_APP_DELEGATE_H_
-#define IOS_CHROME_APP_APP_DELEGATE_H_
-
-#import <UIKit/UIKit.h>
-
-// The main delegate of the application.
-// This class is intended solely to handle the numerous UIApplicationDelegate
-// methods and route to other application objects as appropriate. While this
-// object does create and own other objects, including the ApplicationState
-// object, it shouldn't perform significant manipulation or configuration of
-// them. Nor should any of the method implementations in this class contain
-// significant logic or any specific feature support; that should all be
-// implemented in subsidiary objects this class makes use of.
-@interface AppDelegate : NSObject<UIApplicationDelegate>
-// Do not add any public API to this class. Other code in Chrome shouldn't
-// need to access instances of this class for any purpose.
-@end
-
-#endif  // IOS_CHROME_APP_APP_DELEGATE_H_