[Clean Skeleton] Migrate code to clean/

ios/chrome/app/steps/BUILD.gn

Index: ios/chrome/app/steps/BUILD.gn
diff --git a/ios/chrome/app/steps/BUILD.gn b/ios/chrome/app/steps/BUILD.gn
deleted file mode 100644
index 5d44d5cd8894eb824274591ca60508252798a203..0000000000000000000000000000000000000000
--- a/ios/chrome/app/steps/BUILD.gn
+++ /dev/null
@@ -1,36 +0,0 @@
-# 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.
-
-source_set("steps") {
-  sources = [
-    "launch_to_background.h",
-    "launch_to_background.mm",
-    "launch_to_basic.h",
-    "launch_to_basic.mm",
-    "launch_to_foreground.h",
-    "launch_to_foreground.mm",
-    "tab_grid_coordinator+application_step.h",
-    "tab_grid_coordinator+application_step.mm",
-  ]
-
-  configs += [ "//build/config/compiler:enable_arc" ]
-
-  deps = [
-    "//base",
-    "//components/content_settings/core/browser",
-    "//ios/chrome/app:app_internal",
-    "//ios/chrome/app:application_state_clean_skeleton",
-    "//ios/chrome/app/startup",
-    "//ios/chrome/browser",
-    "//ios/chrome/browser:browser_clean_skeleton",
-    "//ios/chrome/browser:browser_internal",
-    "//ios/chrome/browser/browser_state",
-    "//ios/chrome/browser/browser_state:browser_state_impl",
-    "//ios/chrome/browser/content_settings",
-    "//ios/chrome/browser/ui/tab_grid",
-    "//ios/chrome/browser/web:web_internal",
-    "//ios/net",
-    "//ios/web:web_arc",
-  ]
-}