Lots of misc bug fixes to make the GN build of ios work again.

components/sync_driver/BUILD.gn

 # Copyright 2014 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")
 
 source_set("sync_driver") {
   sources = [
     "about_sync_util.cc",
     "about_sync_util.h",
@@ skipping 213 matching lines @@
     "system_encryptor_unittest.cc",
     "tab_node_pool_unittest.cc",
     "ui_data_type_controller_unittest.cc",
   ]
   deps = [
     ":test_support",
     "//base",
     "//base:prefs_test_support",
     "//base/test:test_support",
     "//components/os_crypt",
-    "//components/policy",
-    "//components/policy:policy_component",
     "//components/pref_registry:test_support",
     "//components/version_info",
     "//net:test_support",
     "//sync:test_support_sync_internal_api",
     "//sync:test_support_sync_api",
     "//testing/gmock",
     "//testing/gtest",
     "//url",
   ]
 
   if (enable_configuration_policy) {
     sources += [ "sync_policy_handler_unittest.cc" ]
+    deps += [
+      "//components/policy",
+      "//components/policy:policy_component",
+    ]
   }
 }