Update GN build files for new prefs location.

components/web_resource/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("web_resource") {
   sources = [
     "eula_accepted_notifier.cc",
     "eula_accepted_notifier.h",
     "notification_promo.cc",
     "notification_promo.h",
@@ skipping 11 matching lines @@
 
   if (is_android || is_ios) {
     sources += [
       "notification_promo_mobile_ntp.cc",
       "notification_promo_mobile_ntp.h",
     ]
   }
 
   deps = [
     "//base",
-    "//base:prefs",
     "//components/google/core/browser",
     "//components/pref_registry",
+    "//components/prefs",
     "//components/version_info",
     "//net",
     "//ui/base",
   ]
 }
 
 static_library("test_support") {
   sources = [
     "resource_request_allowed_notifier_test_util.cc",
     "resource_request_allowed_notifier_test_util.h",
@@ skipping 14 matching lines @@
   ]
 
   if (is_android || is_ios) {
     sources += [ "promo_resource_service_mobile_ntp_unittest.cc" ]
   }
 
   deps = [
     ":test_support",
     ":web_resource",
     "//base",
-    "//base:prefs_test_support",
+    "//components/prefs:test_support",
     "//components/version_info",
     "//net:test_support",
     "//testing/gtest",
     "//third_party/icu",
   ]
 }