Remove target that cause ambiguity with downstream targets.

ios/chrome/app/BUILD.gn

 # Copyright 2015 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.
 
 import("//build/config/ios/rules.gni")
 import("//build/mac/tweak_info_plist.gni")
 import("//ios/build/chrome_build.gni")
 import("//ios/public/provider/chrome/browser/build_config.gni")
 
-# This empty target is there to help with upstreaming by removing a manual
-# step from the process (updating the //ios:all target). It will be changed
-# to a real target as part of upstreaming.
-group("chrome") {
-}
-
-# This empty target is there to help with upstreaming by removing a manual
-# step from the process (updating the //ios:all target). It will be changed
-# to a real target as part of upstreaming.
-group("chrome_clean_skeleton") {
-}
-
 source_set("app") {
   sources = [
     "deferred_initialization_runner.h",
     "deferred_initialization_runner.mm",
     "safe_mode_crashing_modules_config.h",
     "safe_mode_crashing_modules_config.mm",
     "safe_mode_util.cc",
     "safe_mode_util.h",
   ]
 
@@ skipping 69 matching lines @@
   plist_templates = [ "resources/Chrome.entitlements" ]
   if (ios_chrome_entitlements_additions != []) {
     plist_templates += ios_chrome_entitlements_additions
   }
   if (!ios_automatically_manage_certs) {
     plist_templates += [ "resources/AssociatedDomains.entitlements" ]
   }
   substitutions = [ "IOS_BUNDLE_ID_PREFIX=$ios_app_bundle_id_prefix" ]
   output_name = "$target_gen_dir/$chromium_short_name.entitlements"
 }