[Clean Skeleton] Migrate code to clean/

ios/clean/chrome/app/steps/launch_to_background.mm

Index: ios/clean/chrome/app/steps/launch_to_background.mm
diff --git a/ios/chrome/app/steps/launch_to_background.mm b/ios/clean/chrome/app/steps/launch_to_background.mm
similarity index 97%
rename from ios/chrome/app/steps/launch_to_background.mm
rename to ios/clean/chrome/app/steps/launch_to_background.mm
index 9a1fed66b26826d9b96a3a2ff02367ec111d274a..2fde1b8163834acbd120a9309b213ae1eb564dc5 100644
--- a/ios/chrome/app/steps/launch_to_background.mm
+++ b/ios/clean/chrome/app/steps/launch_to_background.mm
@@ -6,7 +6,7 @@
 // =         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>
 
@@ -15,12 +15,12 @@
 #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)