Update GN build files for new prefs location.

chromeos/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/ui.gni")
 import("//testing/test.gni")
 import("//third_party/protobuf/proto_library.gni")
 
 assert(is_chromeos, "Non-ChromeOS builds must not depend on //chromeos")
 
@@ skipping 10 matching lines @@
 component("chromeos") {
   configs += [ "//net/third_party/nss/ssl:ssl_config" ]
   public_deps = [
     "//dbus",
   ]
   deps = [
     ":cryptohome_proto",
     ":power_manager_proto",
     "//base",
     "//base:i18n",
-    "//base:prefs",
     "//base/third_party/dynamic_annotations",
     "//components/device_event_log",
     "//components/onc",
     "//components/policy/proto",
+    "//components/prefs",
     "//components/proxy_config",
     "//components/signin/core/account_id",
     "//crypto",
     "//crypto:platform",
     "//google_apis",
     "//third_party/icu",
     "//third_party/libxml",
     "//third_party/protobuf:protobuf_lite",
     "//url",
   ]
@@ skipping 91 matching lines @@
 
 test("chromeos_unittests") {
   configs += [
     "//build/config/linux:dbus",
     "//net/third_party/nss/ssl:ssl_config",
   ]
   deps = [
     ":cryptohome_proto",
     ":power_manager_proto",
     ":test_support",
-    "//base:prefs_test_support",
     "//base/test:run_all_unittests",
     "//base/test:test_support",
     "//components/onc",
+    "//components/prefs:test_support",
     "//components/proxy_config",
     "//crypto",
     "//crypto:test_support",
     "//dbus:test_support",
     "//google_apis",
     "//net",
     "//net:test_support",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/icu",
@@ skipping 29 matching lines @@
   proto_out_dir = "chromeos/dbus/cryptohome"
 }
 
 proto_library("cryptohome_signkey_proto") {
   sources = [
     "//third_party/cros_system_api/dbus/cryptohome/signed_secret.proto",
   ]
 
   proto_out_dir = "chromeos/cryptohome"
 }