Update GN build files for new prefs location.

components/proximity_auth/cryptauth/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.
 
 source_set("cryptauth") {
   sources = [
     "cryptauth_access_token_fetcher.h",
     "cryptauth_access_token_fetcher_impl.cc",
     "cryptauth_access_token_fetcher_impl.h",
     "cryptauth_api_call_flow.cc",
@@ skipping 21 matching lines @@
     "switches.cc",
     "switches.h",
     "sync_scheduler.cc",
     "sync_scheduler.h",
     "sync_scheduler_impl.cc",
     "sync_scheduler_impl.h",
   ]
 
   deps = [
     "//base",
-    "//base:prefs",
     "//components/gcm_driver",
     "//components/gcm_driver/common",
+    "//components/prefs",
     "//components/proximity_auth/logging",
     "//crypto",
     "//google_apis",
     "//net",
   ]
 
   public_deps = [
     "//components/proximity_auth/cryptauth/proto",
   ]
 }
@@ skipping 33 matching lines @@
     "cryptauth_enroller_impl_unittest.cc",
     "cryptauth_enrollment_manager_unittest.cc",
     "cryptauth_gcm_manager_impl_unittest.cc",
     "fake_secure_message_delegate_unittest.cc",
     "sync_scheduler_impl_unittest.cc",
   ]
 
   deps = [
     ":cryptauth",
     ":test_support",
-    "//base:prefs_test_support",
     "//base/test:test_support",
     "//components/gcm_driver:test_support",
+    "//components/prefs:test_support",
     "//components/proximity_auth",
     "//google_apis:test_support",
     "//net:test_support",
     "//testing/gtest",
   ]
 }