Update GN build files for new prefs location.

components/network_time/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("network_time") {
   sources = [
     "network_time_pref_names.cc",
     "network_time_pref_names.h",
     "network_time_tracker.cc",
     "network_time_tracker.h",
   ]
 
   deps = [
     "//base",
     "//base:i18n",
-    "//base:prefs",
+    "//components/prefs",
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
     "network_time_tracker_unittest.cc",
   ]
 
   deps = [
     ":network_time",
     "//base",
-    "//base:prefs_test_support",
+    "//components/prefs:test_support",
     "//testing/gtest",
   ]
 }