Update GN build files for new prefs location.

components/search_engines/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.
 
 import("//build/config/features.gni")
 import("//tools/json_to_struct/json_to_struct.gni")
 
 static_library("search_engines") {
   sources = [
     "default_search_manager.cc",
@@ skipping 37 matching lines @@
   ]
 
   public_deps = [
     "//components/metrics/proto",
   ]
 
   deps = [
     ":prepopulated_engines",
     "//base",
     "//base:i18n",
-    "//base:prefs",
     "//components/google/core/browser",
     "//components/history/core/browser",
     "//components/keyed_service/core",
     "//components/metrics/proto",
 
     # The search_engines target is in an include cycle with
     # components/omnibox/browser. The cycle is whitelisted in the
     # omnibox/browser target, but should ideally be fixed, then this
     # dependency added:
     #"//components/omnibox/browser",
     "//components/pref_registry",
+    "//components/prefs",
     "//components/rappor",
     "//components/strings",
     "//components/sync_driver",
     "//components/url_formatter",
     "//components/webdata/common",
     "//google_apis",
     "//net",
     "//sql",
     "//sync",
     "//third_party/libxml",
@@ skipping 70 matching lines @@
   }
 }
 
 json_to_struct("prepopulated_engines") {
   visibility = [ ":*" ]
 
   source = "prepopulated_engines.json"
   schema_file = "prepopulated_engines_schema.json"
   namespace = "TemplateURLPrepopulateData"
 }