[Clean Skeleton] Migrate code to clean/

ios/chrome/browser/ui/settings/BUILD.gn

 # 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.
 
 bundle_data("resources") {
   sources = [
     "resources/app_icon_placeholder.png",
     "resources/app_icon_placeholder@2x.png",
     "resources/app_icon_placeholder@3x.png",
     "resources/encryption_error.png",
@@ skipping 350 matching lines @@
     "//ios/web:test_support",
     "//net",
     "//ui/base",
     "//url",
   ]
   libs = [
     "UIKit.framework",
     "XCTest.framework",
   ]
 }
-
-# Clean Skeleton targets.
-source_set("settings_clean_skeleton") {
-  sources = [
-    "settings_coordinator.h",
-    "settings_coordinator.mm",
-  ]
-
-  configs += [ "//build/config/compiler:enable_arc" ]
-
-  deps = [
-    ":settings",
-    "//ios/chrome/browser:browser_clean_skeleton",
-    "//ios/chrome/browser/ui/actions",
-    "//ios/chrome/browser/ui/commands:commands_clean_skeleton",
-  ]
-}