[Clean Skeleton] Migrate code to clean/

ios/chrome/app/app_delegate.mm

-// 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.       =
-// ============================================================================
-
-#import "ios/chrome/app/app_delegate.h"
-
-#import "ios/chrome/app/application_state.h"
-#import "ios/chrome/app/steps/launch_to_background.h"
-#import "ios/chrome/app/steps/launch_to_basic.h"
-#import "ios/chrome/app/steps/launch_to_foreground.h"
-#import "ios/chrome/app/steps/tab_grid_coordinator+application_step.h"
-
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
-@interface AppDelegate ()
-@property(nonatomic, strong) ApplicationState* applicationState;
-@end
-
-@implementation AppDelegate
-
-@synthesize applicationState = _applicationState;
-
-#pragma mark - UIApplicationDelegate (app state changes and system events)
-
-- (BOOL)application:(UIApplication*)application
-    didFinishLaunchingWithOptions:(NSDictionary*)launchOptions {
-  self.applicationState = [[ApplicationState alloc] init];
-  self.applicationState.application = application;
-  [self configureApplicationState];
-
-  [self.applicationState launchWithOptions:launchOptions];
-  return YES;
-}
-
-- (void)applicationDidBecomeActive:(UIApplication*)application {
-}
-
-- (void)applicationWillResignActive:(UIApplication*)application {
-}
-
-- (void)applicationDidEnterBackground:(UIApplication*)application {
-}
-
-- (void)applicationWillEnterForeground:(UIApplication*)application {
-}
-
-- (void)applicationWillTerminate:(UIApplication*)application {
-}
-
-- (void)applicationDidReceiveMemoryWarning:(UIApplication*)application {
-}
-
-#pragma mark - UIApplicationDelegate (background dowloading)
-
-- (void)application:(UIApplication*)application
-    performFetchWithCompletionHandler:
-        (void (^)(UIBackgroundFetchResult))completionHandler {
-}
-
-- (void)application:(UIApplication*)application
-    handleEventsForBackgroundURLSession:(NSString*)identifier
-                      completionHandler:(void (^)())completionHandler {
-}
-
-#pragma mark - UIApplicationDelegate (user activity and quick actions)
-
-- (BOOL)application:(UIApplication*)application
-    willContinueUserActivityWithType:(NSString*)userActivityType {
-  return NO;
-}
-
-- (BOOL)application:(UIApplication*)application
-    continueUserActivity:(NSUserActivity*)userActivity
-      restorationHandler:(void (^)(NSArray*))restorationHandler {
-  return NO;
-}
-
-- (void)application:(UIApplication*)application
-    performActionForShortcutItem:(UIApplicationShortcutItem*)shortcutItem
-               completionHandler:(void (^)(BOOL))completionHandler {
-}
-
-#pragma mark - UIApplicationDelegate (opening URL-specified resources)
-
-- (BOOL)application:(UIApplication*)application
-            openURL:(NSURL*)url
-            options:(NSDictionary<UIApplicationOpenURLOptionsKey, id>*)options {
-  [self.applicationState.URLOpener openURL:url];
-  return YES;
-}
-
-#pragma mark - Private methods
-
-// Configures the application state for application launch by setting the launch
-// steps.
-// Future architecture/refactoring note: configuring the application state in
-// this way is outside the scope of responsibility of the object as defined in
-// the header file. The correct solution is probably a helper object that can
-// perform all of the configuration necessary, and that can be adjusted as
-// needed.
-- (void)configureApplicationState {
-  [self.applicationState.launchSteps addObjectsFromArray:@[
-    [[ProviderInitializer alloc] init],
-    [[SetupBundleAndUserDefaults alloc] init],
-    [[StartChromeMain alloc] init],
-    [[SetBrowserState alloc] init],
-    [[BeginForegrounding alloc] init],
-    [[PrepareForUI alloc] init],
-    [[CompleteForegrounding alloc] init],
-    [[TabGridCoordinator alloc] init],
-  ]];
-}
-
-@end