Remove the //ios/public/test target.

ios/chrome/browser/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/features.gni")
 import("//ios/web/js_compile.gni")
 
 declare_args() {
   google_test_gaia_client_id = ""
   google_test_gaia_client_secret = ""
@@ skipping 671 matching lines @@
   sources = [
     "geolocation/location_manager+Testing.h",
     "geolocation/test_location_manager.h",
     "geolocation/test_location_manager.mm",
     "net/mock_image_fetcher.h",
     "net/mock_image_fetcher.mm",
     "signin/fake_oauth2_token_service_builder.cc",
     "signin/fake_oauth2_token_service_builder.h",
     "signin/fake_signin_manager_builder.cc",
     "signin/fake_signin_manager_builder.h",
+    "sync/fake_sync_service_factory.cc",
+    "sync/fake_sync_service_factory.h",
     "sync/ios_chrome_profile_sync_test_util.cc",
     "sync/ios_chrome_profile_sync_test_util.h",
     "sync/sync_setup_service_mock.cc",
     "sync/sync_setup_service_mock.h",
   ]
 
   deps = [
     "//base",
     "//components/browser_sync/browser",
+    "//components/keyed_service/core",
+    "//components/keyed_service/ios",
     "//components/signin/core/browser",
     "//components/signin/ios/browser",
     "//components/sync_driver",
+    "//components/sync_driver:test_support",
     "//ios/chrome/browser",
     "//ios/chrome/common",
     "//ios/chrome/test",
     "//ios/public/provider/chrome/browser",
+    "//ios/public/provider/chrome/browser:test_support",
     "//ios/web",
+    "//sync",
     "//testing/gmock",
     "//testing/gtest",
     "//ui/base",
     "//url",
   ]
 }