Update GN build files for new prefs location.

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/buildflag_header.gni")
 import("//build/config/features.gni")
 
 source_set("sync_driver") {
   sources = [
     "about_sync_util.cc",
@@ skipping 106 matching lines @@
     "ui_data_type_controller.cc",
     "ui_data_type_controller.h",
     "user_selectable_sync_type.h",
   ]
 
   public_deps = [
     ":features",
   ]
   deps = [
     "//base",
-    "//base:prefs",
     "//base/third_party/dynamic_annotations",
     "//components/data_use_measurement/core",
     "//components/invalidation/public",
     "//components/os_crypt",
+    "//components/prefs",
     "//components/pref_registry",
     "//components/signin/core/browser",
     "//components/version_info",
     "//google_apis",
     "//net",
     "//sync",
     "//third_party/cacheinvalidation",
   ]
 
   if (enable_configuration_policy) {
@@ skipping 81 matching lines @@
     "startup_controller_unittest.cc",
     "sync_prefs_unittest.cc",
     "sync_stopped_reporter_unittest.cc",
     "sync_util_unittest.cc",
     "system_encryptor_unittest.cc",
     "ui_data_type_controller_unittest.cc",
   ]
   deps = [
     ":test_support",
     "//base",
-    "//base:prefs_test_support",
     "//base/test:test_support",
     "//components/invalidation/impl",
     "//components/os_crypt",
     "//components/pref_registry:test_support",
+    "//components/prefs:test_support",
     "//components/signin/core/browser:test_support",
     "//components/syncable_prefs",
     "//components/syncable_prefs:test_support",
     "//components/version_info",
     "//net:test_support",
     "//sync:test_support_sync_api",
     "//sync:test_support_sync_internal_api",
     "//testing/gmock",
     "//testing/gtest",
     "//url",
   ]
 
   if (enable_configuration_policy) {
     sources += [ "sync_policy_handler_unittest.cc" ]
     deps += [
       "//components/policy",
       "//components/policy:policy_component",
     ]
   }
 }
 
 buildflag_header("features") {
   header = "sync_driver_features.h"
 
   # Whether to back up data before sync.
   enable_pre_sync_backup = is_win || is_mac || (is_linux && !is_chromeos)
 
   flags = [ "ENABLE_PRE_SYNC_BACKUP=$enable_pre_sync_backup" ]
 }