Removed NativeAppsCollectionViewController and related code.

ios/chrome/browser/ui/settings/cells/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.
 
 source_set("cells") {
   sources = [
     "account_signin_item.h",
     "account_signin_item.mm",
     "autofill_data_item.h",
     "autofill_data_item.mm",
     "byo_textfield_item.h",
     "byo_textfield_item.mm",
     "card_multiline_item.h",
     "card_multiline_item.mm",
     "copied_to_chrome_item.h",
     "copied_to_chrome_item.mm",
     "encryption_item.h",
     "encryption_item.mm",
     "import_data_multiline_detail_cell.h",
     "import_data_multiline_detail_cell.mm",
-    "native_app_item.h",
-    "native_app_item.mm",
     "passphrase_error_item.h",
     "passphrase_error_item.mm",
     "password_details_item.h",
     "password_details_item.mm",
     "sync_switch_item.h",
     "sync_switch_item.mm",
     "text_and_error_item.h",
     "text_and_error_item.mm",
     "version_item.h",
     "version_item.mm",
@@ skipping 16 matching lines @@
 source_set("unit_tests") {
   testonly = true
   sources = [
     "account_signin_item_unittest.mm",
     "autofill_data_item_unittest.mm",
     "byo_textfield_item_unittest.mm",
     "card_multiline_item_unittest.mm",
     "copied_to_chrome_item_unittest.mm",
     "encryption_item_unittest.mm",
     "import_data_multiline_detail_cell_unittest.mm",
-    "native_app_item_unittest.mm",
     "passphrase_error_item_unittest.mm",
     "password_details_item_unittest.mm",
     "sync_switch_item_unittest.mm",
     "text_and_error_item_unittest.mm",
     "version_item_unittest.mm",
   ]
 
   deps = [
     ":cells",
     "//components/strings",
     "//ios/chrome/app/strings",
     "//ios/chrome/browser/ui/collection_view/cells",
     "//ios/chrome/browser/ui/collection_view/cells:test_support",
     "//testing/gtest",
     "//ui/base",
   ]
 
   configs += [ "//build/config/compiler:enable_arc" ]
 }