Update GN build files for new prefs location.

components/security_interstitials/core/BUILD.gn

 # Copyright 2015 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.
 
 # GYP version: components/security_interstitials.gyp:security_interstitials_core
 static_library("core") {
   sources = [
     "bad_clock_ui.cc",
     "bad_clock_ui.h",
     "common_string_util.cc",
     "common_string_util.h",
     "controller_client.cc",
     "controller_client.h",
     "metrics_helper.cc",
     "metrics_helper.h",
     "ssl_error_ui.cc",
     "ssl_error_ui.h",
   ]
 
   deps = [
     "//base",
     "//base:i18n",
-    "//base:prefs",
     "//components/google/core/browser",
     "//components/history/core/browser",
     "//components/metrics",
+    "//components/prefs",
     "//components/rappor",
     "//components/ssl_errors",
     "//components/strings",
     "//components/url_formatter",
     "//net",
     "//ui/base",
   ]
 }