[Clean Skeleton] Migrate code to clean/

ios/clean/chrome/app/steps/launch_to_background.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/steps/launch_to_background.h"
+#import "ios/clean/chrome/app/steps/launch_to_background.h"
 
 #include <memory>
 
 #include "base/mac/bundle_locations.h"
 #include "base/mac/foundation_util.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/supports_user_data.h"
-#include "ios/chrome/app/application_state.h"
 #include "ios/chrome/app/startup/ios_chrome_main.h"
 #include "ios/chrome/app/startup/register_experimental_settings.h"
 #include "ios/chrome/browser/application_context.h"
 #include "ios/chrome/browser/browser_state/chrome_browser_state_manager.h"
 #include "ios/chrome/browser/web/chrome_web_client.h"
+#include "ios/clean/chrome/app/application_state.h"
 #include "ios/web/public/web_client.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 // Step that removes a previously-stored IOSChromeMain instance.
 @interface StopChromeMain : NSObject<ApplicationStep>
 @end
 
@@ skipping 88 matching lines @@
          state.phase == APPLICATION_BACKGROUNDED;
 }
 
 - (void)runInState:(ApplicationState*)state {
   state.browserState = GetApplicationContext()
                            ->GetChromeBrowserStateManager()
                            ->GetLastUsedBrowserState();
 }
 
 @end