Convert "ios_packed_resources" gyp target to gn.

ios/chrome/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("//ios/build/config.gni")
 import("//testing/test.gni")
 
 bundle_data("ios_chrome_unittests_bundle_data") {
   testonly = true
@@ skipping 66 matching lines @@
     "//components/password_manager/core/browser:test_support",
     "//components/password_manager/core/common",
     "//components/prefs:test_support",
     "//components/signin/core/browser:test_support",
     "//components/signin/ios/browser:test_support",
     "//components/sync_driver:test_support",
     "//components/syncable_prefs:test_support",
     "//components/update_client",
     "//components/version_info",
     "//ios/chrome/app",
+    "//ios/chrome/app/resources:packed_resources",
     "//ios/chrome/browser",
     "//ios/chrome/browser:test_support",
     "//ios/chrome/common",
     "//ios/chrome/test",
     "//ios/chrome/test:run_all_unittests",
     "//ios/public/provider/chrome/browser",
     "//ios/public/provider/chrome/browser:test_support",
     "//ios/web",
     "//ios/web:test_support",
     "//net:test_support",
     "//skia",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/ocmock",
     "//ui/gfx:test_support",
   ]
 
   assert_no_deps = ios_assert_no_deps
 }