iOS: Re-add bits of GTM we actually use.

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 59 matching lines @@
     "browser/ui/elements/selector_picker_view_controller_unittest.mm",
     "browser/ui/keyboard/UIKeyCommand+ChromeTest.mm",
     "browser/ui/keyboard/hardware_keyboard_watcher_unittest.mm",
     "browser/ui/native_content_controller_unittest.mm",
     "browser/ui/ui_util_unittest.mm",
     "browser/ui/uikit_ui_util_unittest.mm",
     "browser/update_client/ios_chrome_update_query_params_delegate_unittest.cc",
     "browser/web_resource/web_resource_util_unittest.cc",
     "browser/webp_transcode/webp_decoder_unittest.mm",
     "common/string_util_unittest.mm",
+    "test/google_toolbox_unittest.mm",
   ]
 
   deps = [
     ":ios_chrome_unittests_bundle_data",
     ":native_content_controller_test_xib",
     "//base",
     "//base/test:test_support",
     "//components/autofill/core/common:common",
     "//components/autofill/ios/browser:browser",
     "//components/bookmarks/test",
@@ skipping 19 matching lines @@
     "//ios/chrome/test:run_all_unittests",
     "//ios/public/provider/chrome/browser",
     "//ios/public/provider/chrome/browser:test_support",
     "//ios/testing:ocmock_support",
     "//ios/web",
     "//ios/web:test_support",
     "//net:test_support",
     "//skia",
     "//testing/gmock",
     "//testing/gtest",
+    "//third_party/google_toolbox_for_mac",
     "//third_party/ocmock",
     "//ui/gfx:test_support",
   ]
 
   assert_no_deps = ios_assert_no_deps
 }