Update GN build files for new prefs location.

components/gcm_driver/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.
 
 # GYP version: components/gcm_driver.gypi:gcm_driver
 static_library("gcm_driver") {
   sources = [
     "android/component_jni_registrar.cc",
     "android/component_jni_registrar.h",
     "default_gcm_app_handler.cc",
@@ skipping 43 matching lines @@
     "gcm_stats_recorder_impl.cc",
     "gcm_stats_recorder_impl.h",
     "registration_info.cc",
     "registration_info.h",
     "system_encryptor.cc",
     "system_encryptor.h",
   ]
 
   deps = [
     "//base",
-    "//base:prefs",
     "//components/gcm_driver/common",
     "//components/gcm_driver/crypto",
     "//components/keyed_service/core",
     "//components/os_crypt",
     "//components/pref_registry",
+    "//components/prefs",
     "//components/signin/core/browser",
     "//components/sync_driver",
     "//components/version_info",
     "//google_apis",
     "//google_apis/gcm",
     "//net",
     "//sync/protocol",
     "//url:url",
   ]
   allow_circular_includes_from = [ "//components/gcm_driver/crypto" ]
@@ skipping 72 matching lines @@
     "gcm_delayed_task_controller_unittest.cc",
     "gcm_driver_desktop_unittest.cc",
     "gcm_stats_recorder_android_unittest.cc",
     "gcm_stats_recorder_impl_unittest.cc",
   ]
 
   deps = [
     ":gcm_driver",
     ":test_support",
     "//base",
-    "//base:prefs_test_support",
     "//base/test:test_support",
+    "//components/prefs:test_support",
     "//google_apis:test_support",
     "//google_apis/gcm:test_support",
     "//net:test_support",
     "//sync/protocol",
     "//testing/gtest",
     "//third_party/protobuf:protobuf_lite",
   ]
 
   if (is_android) {
     sources -= [
       "gcm_account_mapper_unittest.cc",
       "gcm_channel_status_request_unittest.cc",
       "gcm_client_impl_unittest.cc",
       "gcm_driver_desktop_unittest.cc",
       "gcm_stats_recorder_impl_unittest.cc",
     ]
   }
 }