Update GN build files for new prefs location.

components/google/core/browser/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.
 
 static_library("browser") {
   sources = [
     "google_pref_names.cc",
     "google_pref_names.h",
     "google_switches.cc",
     "google_switches.h",
     "google_url_tracker.cc",
     "google_url_tracker.h",
     "google_url_tracker_client.cc",
     "google_url_tracker_client.h",
     "google_util.cc",
     "google_util.h",
   ]
 
   deps = [
     "//base",
-    "//base:prefs",
     "//components/data_use_measurement/core",
     "//components/keyed_service/core",
     "//components/pref_registry",
+    "//components/prefs",
     "//components/strings",
     "//components/url_formatter",
     "//net",
     "//url",
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
 
   sources = [
     "google_url_tracker_unittest.cc",
     "google_util_unittest.cc",
   ]
 
   deps = [
     ":browser",
     "//base",
-    "//base:prefs",
-    "//base:prefs_test_support",
+    "//components/prefs:test_support",
     "//net:test_support",
     "//testing/gtest",
   ]
 }